Added functions to enable/disable allowed/disallowed partition functions


sql/item.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/item_cmpfunc.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/item_func.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/item_strfunc.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/item_timefunc.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/item_xmlfunc.h:
  Added functions to enable/disable allowed/disallowed partition functions
sql/partition_info.cc:
  Added functions to enable/disable allowed/disallowed partition functions
sql/share/errmsg.txt:
  Added new error message