gimp_plugin_help_register - Register a help path for a plug-in.
SYNOPSIS
gimp_plugin_help_register (help_path)
DESCRIPTION
This procedure changes the help rootdir for the plug-in which calls it. All subsequent calls of gimp_help from this plug-in will be interpreted relative to this rootdir. This procedure can only be called in the query function of a plug-in and it has to be called before any procedure is installed.