Fixed memory leak in new filesort code
Optimzed sub selects to use keys with outer references.
Increased max tables in join to 62


client/Makefile.am:
  Remve test programs
myisam/mi_check.c:
  Remove compiler warnings
myisam/mi_delete.c:
  Remove 'rnd' variable to make usage repeatable
myisam/mi_open.c:
  Remove 'rnd' variable to make usage repeatable
myisam/mi_write.c:
  Remove 'rnd' variable to make usage repeatable
myisam/myisamdef.h:
  Remove 'rnd' variable to make usage repeatable
myisam/myisamlog.c:
  Remove 'rnd' variable to make usage repeatable
mysql-test/r/subselect.result:
  new test
mysql-test/t/join.test:
  Updated test
mysql-test/t/subselect.test:
  new test
sql/filesort.cc:
  Added function to free buffers allocated by filesort
sql/item.cc:
  Sub select optimization
sql/item_cmpfunc.cc:
  Sub select optimization
sql/item_subselect.cc:
  Sub select optimization
sql/item_sum.cc:
  Removed compiler warnings
sql/item_sum.h:
  Simple code cleanup
sql/log.cc:
  Removed compiler warning
sql/mysql_priv.h:
  Made table_map ulonglong to allow 62 tables in join
sql/records.cc:
  Moved free of filesort buffers to own function
sql/sql_select.cc:
  subselect optimization
  Call filesort_free_buffers() to free memory from filesort
sql/unireg.h:
  Sub select optimization