Fixed race condition in event that could cause hang when stopping event scheduler with SET GLOBAL event_scheduler=OFF 

client/mysqltest.cc:
  Write command to be executed to the log BEFORE executing the command.
  This makes it easier to debug crashes as the log will contain the fatal command.
mysql-test/r/mysqltest.result:
  Updated results (we now get more things logged)
sql/event_queue.cc:
  Fixed race condition in event that could cause hang when stopping event scheduler with SET GLOBAL event_scheduler=OFF.
  The reason was that a kill signal could be sent between last check of thd->killed and before thd->enter_cond() in which case the signal
  would be missed and we would be stuck in Event_scheduler::stop() forever.

Reverted unittest/unit.pl back to Test::Harness as some of our build machines didn't support the new recommended TAP::Harness module

unittest/mytap/tap.c:
  Fixed output for some tests that didn't call plan()

storage/maria/unittest/ma_test_loghandler-t.c:
  Don't sync during test
storage/maria/unittest/ma_test_loghandler_multigroup-t.c:
  Don't sync during test
storage/maria/unittest/ma_test_loghandler_multithread-t.c:
  Don't sync during test
unittest/mysys/bitmap-t.c:
  Don't test all bit combinations (not needed)
unittest/mysys/thr_template.c:
  Remove sleep as old bug should be fixed nowadays
unittest/mysys/waiting_threads-t.c:
  Only run test with --big
unittest/mytap/tap.c:
  Print total time at end of test.
unittest/unit.pl:
  Use TAP::Harness instead of Test::Harness (recommended according to manual)
  Add times to tests.

Fixed compiler warnings

client/readline.cc:
  Fixed compiler warning
mysql-test/suite/innodb/t/innodb_bug60049.test:
  This test failed when running with --mysqld=--loose-innodb-fast-shutdown=2 which we do on some machines
mysql-test/t/mysqldump.test:
  Only run test if utf8 is used
sql/log.cc:
  Fixed compiler warning
sql/mysql_priv.h:
  Fixed compiler warnings
tests/mysql_client_test.c:
  Don't abort test if ucs2 is not in use.

Fixed compiler warnings

client/readline.cc:
  Fixed compiler warning
mysql-test/t/mysqldump.test:
  Only run test if utf8 is used
sql/log.cc:
  Fixed compiler warning
sql/mysql_priv.h:
  Fixed compiler warnings
tests/mysql_client_test.c:
  Don't abort test if ucs2 is not in use.

into 5.1

The reason for mtr warning is that collect_mysqld_features() starts mysqld with --datadir=/tmp and this 
directory does not exist on Windows.

Fix : instead of passing --datadir=$opt_vardir/tmp in collect_mysqld_features() just use --datadir=.
mysqld does not need a correct directory, just an existing one, as it is started with --help ---verbose -skip-grant-tables.

mysql-test/suite/funcs_1/r/is_columns_is.result:
  Updated test results
mysql-test/suite/pbxt/r/client_xml.result:
  Updated test results
mysys/Makefile.am:
  Added back my_port.c
storage/xtradb/buf/buf0buddy.c:
  Removed not used variables
storage/xtradb/fil/fil0fil.c:
  Added casts to fix compiler warnings

- from xtradb merge
- portability error in bitmap-t.c ( variable size  array in non-portable)

Moved some BSD string functions from Unireg

lp:~percona-dev/percona-server/release-5.1.56-12.7 percona-server-5.1.56-12.7
as of April 29, 2011.

Merged: revid:ignacio.nin@percona.com-20110427224434-e5a4kpyfwvj641q3

               FAILS WITH LIBEDIT

Fixed by checking the return value of the write()
function calls and handling the open files and fd
appropriately.


cmd-line-utils/libedit/vi.c:
  BUG#12329909 - BUILDING MYSQL WITH DEBUG SUPPORT
                 FAILS WITH LIBEDIT
  
  Added a check on the return value of the write()
  function calls.

calc_daynr() function returns negative result
if malformed date with zero year and month is used.
Attempt to calculate week day on negative value
leads to crash. The fix is return NULL for
'W', 'a', 'w' specifiers if zero year and month is used.
Additional fix for calc_daynr():
--added assertion that result can not be negative
--return 0 if zero year and month is used


mysql-test/r/func_time.result:
  test case
mysql-test/t/func_time.test:
  test case
sql-common/my_time.c:
  --added assertion that result can not be negative
  --return 0 if zero year and month is used
sql/item_timefunc.cc:
  eturn NULL for 'W', 'a', 'w' specifiers
  if zero year and month is used.