fixed bug in variable assignment in mysqltest
fixed coredump on conversion from empty blob/text to date
added test case for empty blob conversion to date


BUILD/compile-pentium-debug:
  move bdb/innobase to compile-pentium-debug-max
client/mysqltest.c:
  fixed bug in variable assignment
sql/time.cc:
  fixed coredump on conversion from empty blob/text to date