updated all relevant files to honor this change (as discussed with vva)
 - added some more comments to the fill_help_tables script
 - minor cleanups


scripts/Makefile.am:
   - renamed fill_funct_tables -> fill_help_tables to clarify purpose
     of this script (after discussing this with vva)
   - make sure "make clean" removes both the output and the script
   - fixed tabbing
scripts/fill_help_tables.sh:
   - reflect name change, add some more info about the function of this script
scripts/mysql_install_db.sh:
   - renamed fill_func_tables.sql -> fill_help_tables.sql (this does not yet
     resolve the problem that mysql_install_db does not find this file in 
     the binary distribution)