Small fixes while doing review of new pushed code
More test cases for decimal


mysql-test/r/date_formats.result:
  Warnings added for STR_TO_DATE()
mysql-test/r/ps_1general.result:
  Better description for BLACKHOLE
mysql-test/r/strict.result:
  Added tests for STR_TO_DATE
mysql-test/r/type_decimal.result:
  Test to test ranges of DECIMAL
mysql-test/t/date_formats.test:
  More tests
mysql-test/t/strict.test:
  Added tests for STR_TO_DATE
mysql-test/t/type_decimal.test:
  Test to test ranges of DECIMAL
sql/field.cc:
  Simple optimization
sql/handler.cc:
  Better description for BLACKHOLE
sql/item_timefunc.cc:
  Give warnings if wrong date/time/datetime argument for STR_TO_DATE
sql/log_event.cc:
  Indentation fixes
sql/log_event.h:
  #ifdef-ed not used code
sql/share/errmsg.txt:
  New error message
sql/sql_show.cc:
  Ensure that we do a proper restore in case of error