Make first_linear_tab()/next_linear_tab() use named constants instead of TRUE/FALSE flags, for better readability.

MWL#90: Address review feedback: fix a problem introduced a few csets earlier: Do perform tab->cleanup()
for const tables in JOIN::cleanup().

- among everything else, switch to using first/next_linear_tab() in make_outerjoin_info().

- In join buffering code, call join_tab_execution_startup() (#1) before we call join_tab_scan->open() (#2).
  This is important with SJ-Materialization because #1 fills the materialized table, while
  #2 will actually try to read the first row. Attempt to read the first row before we have
  populated the materialized table would cause zero rows to be returned when actually there were matches.

- Make equality-substitution-for-ref-access code in JOIN::optimize() treat join_tab->ref.key_copy correctly
  (in the way create_ref_for_key() has filled it).

The bug in the function print_keyuse() caused crashes if
hash join could be used. It happened because the function
ignored the fact that KEYUSE structures could be created
for hash joins as well. 

sql/mysqld.cc:
  Fixed: optimize_join_buffer_size was missing in the description of possible
  options for the optimizer switch.
sql/sql_select.cc:
  Fixed: initialization for the field ref_table_rows of the KEYUSE structure was 
  missing (as a result of a lame merge).

- Make get_constant_key_infix() take into account that there may be SEL_TREEs with
  type=SEL_ARG::MAYBE_KEY, which it cannot process, because they are not real ranges
  but rather indications that we might have been able to construct a range if we had
  values for some other tables' fields. 
  (check_quick_select() already has such check)

client/readline.cc:
  Initialize not used variable (to kill wrong compiler warning)
mysql-test/suite/handler/aria.result:
  Updated test result
mysql-test/suite/handler/handler.inc:
  Changed index to ensure rows are in a fixed order
mysql-test/suite/handler/heap.result:
  Updated test result
mysql-test/suite/handler/innodb.result:
  Updated test result
mysql-test/suite/handler/myisam.result:
  Updated test result
plugin/handler_socket/handlersocket/Makefile.am:
  Use CXX flags to compile
sql/filesort.cc:
  Initialize variable that may be used
sql/log.cc:
  Initialize not used variable (to kill wrong compiler warning)
sql/opt_range_mrr.cc:
  Fixed cast to avoid compiler warning
storage/xtradb/fil/fil0fil.c:
  Added cast to avoid compiler warning

- Don't access THD::killed directly from ha_innodb.cc. This is forbidden because 
  THD has different membership (and so, different member offsets) in regular and embedded server.
  Access must be done through thd_killed() function.

- if we're interrupted by the user while in XtraDB, return the proper code.

even in the cases when there existed range/index-merge scans that
were cheaper than the full table scan.
This was a defect/bug of the implementation of mwl #128. 
Now hash join can work not only with full table scan of the joined
table, but also with full index scan, range and index-merge scans.
Accordingly, in the cases when hash join is used the column 'type'
in the EXPLAINs can contain now 'hash_ALL', 'hash_index', 'hash_range'
and 'hash_index_merge'. If hash join is coupled with a range/index_merge
scan then the columns 'key' and 'key_len' contain info not only on
the used hash index, but also on the indexes used for the scan.   

- Linking now with g++ instead of gcc with 'compile-dist' to solve problems with handlersocket/client
- Fixed bug in heap tables when doing handler read next-prev over last row


BUILD/compile-dist:
  - Linking now with g++ instead of gcc with 'compile-dist' to solve problems with handlersocket/client
cmd-line-utils/libedit/vi.c:
  Fixed compiler warning about not checking return value for write
mysql-test/r/index_intersect.result:
  Updated results (missed this file in my last push)
mysql-test/suite/handler/aria.result:
  Updated test results
mysql-test/suite/handler/handler.inc:
  Changed test to use read next/read prev on key where there are duplicates that can come in different order depending on system
  Added testing of read next-prev over last row and read prev-next around first row
mysql-test/suite/handler/heap.result:
  Updated test results
mysql-test/suite/handler/init.inc:
  More rows to test
mysql-test/suite/handler/innodb.result:
  Updated test results
mysql-test/suite/handler/interface.result:
  Updated test results
mysql-test/suite/handler/myisam.result:
  Updated test results
mysql-test/t/variables-big.test:
  Fixed test to not fail on windows
mysql-test/valgrind.supp:
  Removed not matching fun: to get rid of valgrind warning
storage/heap/hp_rfirst.c:
  Added state so that we know if we have an active position in the index.
storage/heap/hp_rkey.c:
  Added state so that we know if we have an active position in the index.
storage/heap/hp_rnext.c:
  Handle reading several next after finding the last row (this caused a crash before)
storage/heap/hp_rprev.c:
  Handle reading several prev after finding the first row (this caused a crash before)
storage/xtradb/buf/buf0buf.c:
  Fixed compiler warning about uninitialized value

dbug/dbug.c:
  Fixed compiler warnings on windows
mysql-test/r/index_intersect_innodb.result:
  Don't print number of rows as this varies
mysql-test/suite/funcs_1/r/processlist_val_no_prot.result:
  Update to use new State
mysql-test/suite/handler/heap.result:
  Update results
mysql-test/suite/handler/heap.test:
  Changed key used in test as the key 'b' will not guarantee order of the two last elements (as the key value is the same)
mysql-test/suite/pbxt/r/lock_multi.result:
  Update to use new State
mysql-test/t/index_intersect.test:
  Don't print number of rows as this varies
mysql-test/valgrind.supp:
  Added suppression for linux
mysys/hash.c:
  Fixed compiler warnings on windows
plugin/handler_socket/handlersocket/database.cpp:
  Fixed compiler warnings
sql-common/client_plugin.c:
  Changed variable to define to avoid compiler warnings when variable is not used
sql-common/my_time.c:
  Initialize all my_time elements to avoid compiler warnings
storage/oqgraph/ha_oqgraph.cc:
  Use right function (to avoid compiler warning)
storage/pbxt/src/table_xt.cc:
  Initialize variables (to avoid compiler warnings)

where bison runs in parallel with the same input and output files

- Cherrypick MBUG#688404  (PBXT crashes in debug/x64)
- Fix unixism (rm -rf) in the test suite_timeout
- Avoid plugin tests on Windows/embedded, plugins do not and will not work here

- Fixed compiler errors
- Modified Makefiles to be part of plugin directory
- Some minor changes in database.cpp to use the new MariaDB handler interface