Added following functions:
PRM2Stack - Push multiple parameters to stack easily.
pushtable_items - Convenience function for adding ordered items to a table.
PRMat - Push a stack value to the stack (via parameter list).
lua_gc - Garbage collection routine.
flua_error_event - Just a place to put a breakpoint for when errors are caught by default handler.
flua_is_usertype - Check if the given value is a userdata with a registered name.
getTblItem - Convenience function for getting an indexed item from a table.

Fixed autoindex for user types.