Fixes after last merge from 4.0.
(Code not yet complete, need anoter merge from 4.0)


heap/hp_write.c:
  cleanup
myisam/ft_boolean_search.c:
  Fixed tree handling to new format
mysql-test/r/alter_table.result:
  SHOW FULL COLUMN FROM TABLE now returns comment
mysql-test/r/func_math.result:
  Updated results
mysql-test/r/heap_btree.result:
  Portability fix
mysql-test/r/isam.result:
  SHOW FULL COLUMN FROM TABLE now returns comment
mysql-test/r/show_check.result:
  SHOW FULL COLUMN FROM TABLE now returns comment
mysql-test/t/heap_btree.test:
  Portability fix
mysql-test/t/show_check.test:
  SHOW FULL COLUMN FROM TABLE now returns comment
sql/field.cc:
  Fix for comment handling
sql/field.h:
  Added CHARSET_INFO to field structure
sql/item_cmpfunc.cc:
  Fixed like to use system charset (need to be updated)
sql/item_func.cc:
  Update to new charset handling
sql/mysql_priv.h:
  cleanup
sql/sql_base.cc:
  Added charset to HA_CREATE_INFO
sql/sql_delete.cc:
  Added charset to HA_CREATE_INFO
sql/sql_parse.cc:
  Added charset to HA_CREATE_INFO
sql/sql_select.cc:
  cleanup
sql/sql_show.cc:
  charset change
sql/sql_string.h:
  cleanup
sql/sql_table.cc:
  cleanup
sql/sql_yacc.yy:
  Go back to old code for ALTER table ... MODIFY
sql/table.cc:
  fixed comment handling
sql/unireg.cc:
  new field format