We no longer need the install() function for installs that only set
the module version number. Same for upgrade(). Do a general cleanup
of all installers and remove the ones that are no longer necessary.
helper which in turn calls HTMLPurifier. This makes a cleaner
inter-module API. The module has to be renamed to avoid having two
classes called "HTMLPurifier"
Also clean up the module.info and move the config settings over from
modules/gallery.