* noreply:
  renamed mailfromnon to mailfromnobody, use in subscriptions
  added mailfromnone internal option FS#2170

Conflicts:
	inc/subscription.php

* make use of $INPUT
* clean up coding style
* add phpdoc comments

makes it easier to access our do parameters

This fixes problems with setgid bits on the media directory

Seems like matching \b on unicode strings is unreliable across different
platforms (Debian). Using Unicode class lookahed/behinds seems to work
though.

This fixes a warning when setting $meta['relation']['firstimage']
using p_set_metadata.

In p_render() it is assumed that all renderers have a $doc variable