DSM-5.0 compatibility

Beginging with firmware version 4419 or laster, apache now run
under the "http" user instead of "nobody". Add version check to
installers and set the user appropriately for services that install or
access the webserver directory.
Merge branch 'develop-dsm50' of https://github.com/saschpe/spksrc into dsm50
tt-rss: Add DSM5.0 compatibility
Selfoss: Add DSM5.0 compatibility
Owncloud: Add DSM5.0 compatibility
mantisbt: Add DSM5.0 compatibility
Fengoffice: Add DSM5.0 compatibility
roundcube: Add DSM5.0 compatibility
rutorrent: Add DSM5.0 compatibility
Newznab
- DSM5.0 compatibility
- Use PEAR package, fix digests