but still strange interferences between multiple function invocations...


mysql-test/r/sp.result:
  New FUNCTION tests.
mysql-test/t/sp.test:
  New FUNCTION tests.
sql/item_func.cc:
  Fixed field_type bug; now string functions work too.
  Removed unecessary function which was added in a state of confusion.
sql/item_func.h:
  Fixed field_type bug; now string functions work too.
  Removed unecessary function which was added in a state of confusion.
sql/sp_head.cc:
  Fixed string type bug, and set the right charset.