- Re-commit Monty's merge, partially fixed by Igor and SergeyP, 
  but still broken

The reason for this was that some bitmap test functions changed the bitmap, which caused problems when the same bitmap was used by multiple threads.


include/my_bitmap.h:
  Changed order of elements to get better alignment.
mysys/my_bitmap.c:
  Change bitmap test functions to not modify the bitmap.
  Fixed compiler errors in test_bitmap

Updated results for failing test cases (In all cases the estimated number of rows was different)

Fixed failing pbxt test


include/maria.h:
  Added maria_upgrade()
mysql-test/suite/pbxt/r/select.result:
  Don't print number of rows as this is not constant over different runs
mysql-test/suite/pbxt/t/select.test:
  Don't print number of rows as this is not constant over different runs
storage/maria/ha_maria.cc:
  Run maria_upgrade() before maria_init()
storage/maria/ma_init.c:
  Move maria_upgrade() out of maria_init() as in standalone programs maria_data_root is not set.

Fix cleanup to really remove 'aria_log' files. Fixes failures in maria unit tests on some platforms.
Fixed compiler warnings

include/mysql/plugin.h:
  Changed def_val back to const, to remove compiler warnings.
storage/maria/ma_init.c:
  Rename control file and log files from maria_xxx to aria_xxx when upgrading from MariaDB 5.1
storage/maria/unittest/ma_maria_log_cleanup.c:
  Fix cleanup to really remove 'aria_log' files. Fixes failures in maria unit tests on some platforms.

The condition over the outer tables now are extracted from
the on condition of any outer join. This condition is
saved in a special field of the JOIN_TAB structure for
the first inner table of the outer join. The condition
is checked before the first inner table is accessed. If 
it turns out to be false the table is not accessed at all
and a null complemented row is generated immediately.

the setting of optimizer switch for table elimination.

Change some my_bool in C++ classes and a few functions to bool to detect wrong usage of bool/my_bool.
Fix some bugs where we stored values other than 0 or 1 in my_bool
Fixed some compiler warnings


client/mysql.cc:
  Changed interrupted_query from my_bool to int, as we stored 2 in it.
client/mysqladmin.cc:
  Changed return variable type to same type as function value type
client/mysqltest.cc:
  Changed 'found' to int as we store other values than 0 or 1 into it
  Changed type for parameter of set_reconnect() to match usage.
extra/libevent/evbuffer.c:
  Added __attribute__((unused))
extra/libevent/event.c:
  Added __attribute__((unused))
extra/libevent/signal.c:
  Added __attribute__((unused))
sql/event_data_objects.h:
  my_bool -> bool
sql/event_db_repository.cc:
  my_bool -> bool
sql/event_db_repository.h:
  my_bool -> bool
sql/event_parse_data.h:
  my_bool -> bool
sql/events.cc:
  my_bool -> bool
sql/events.h:
  my_bool -> bool
sql/field.cc:
  my_bool -> bool
sql/field.h:
  my_bool -> bool
sql/hash_filo.h:
  my_bool -> bool
sql/item.cc:
  my_bool -> bool
sql/item.h:
  my_bool -> bool
sql/item_cmpfunc.h:
  my_bool -> bool
  Changed result_for_null_param from my_bool to int as we stored -1 in it.
sql/item_func.cc:
  my_bool -> bool
  Modified udf wrapper functions so that the UDF functions would continue to use my_bool. (To keep compatibility with UDF:s)
sql/item_func.h:
  my_bool -> bool
sql/item_subselect.h:
  my_bool -> bool
sql/item_sum.cc:
  Modified udf wrapper functions so that the UDF functions would continue to use my_bool. (To keep compatibility with UDF:s)
sql/parse_file.h:
  my_bool -> bool
sql/rpl_mi.h:
  my_bool -> bool
sql/sp_rcontext.h:
  my_bool -> bool
sql/sql_analyse.h:
  my_bool -> bool
sql/sql_base.cc:
  Change some assignments so that we don't initialize bool variables with int's.
sql/sql_bitmap.h:
  my_bool -> bool
sql/sql_cache.cc:
  my_bool -> bool
sql/sql_cache.h:
  my_bool -> bool
sql/sql_class.h:
  my_bool -> bool
sql/sql_insert.cc:
  Change some assignments so that we don't initialize bool variables with int's.
sql/sql_prepare.cc:
  my_bool -> bool
sql/table.h:
  my_bool -> bool
storage/maria/ma_check.c:
  Removed duplicate assignment
strings/decimal.c:
  Fixed wrong variable usage.
  Don't do complex arithmetic on bool when simple works.

Fix usage of mysqld option --new, --old, --safe and --skip_new to not disable things that are proven stable or enable things that are not usefull.


sql/field.cc:
  Remove feature of 'new_mode' that was never implemtented in a newer MySQL version.
sql/item_cmpfunc.cc:
  Boyer more is stable; Don't have to be protected by --skip-new anymore
sql/mysqld.cc:
  Don't disable some proven stable functions with --skip-new
sql/records.cc:
  Don't disable record caching with --safe-mode anymore
sql/sql_delete.cc:
  Do fast truncate even if --skip-new or --safe is used
sql/sql_parse.cc:
  Use always mysql_optimizer() for optimizer (instead of mysql_recreate_table() in case of --safe or --skip-new)
sql/sql_select.cc:
  Don't disable 'only_eq_ref_tables' if --safe is used.
sql/sql_yacc.yy:
  Removed not meaningfull test of --old

corrected the manual url to point to kb

The implementation of the virtual method not_null_tables for the class
Item_outer_ref must always return 0.

Made sure that rr_quick is used to read the next record whenever
a quick select is used to retrieve the table records.