Debian: Remove unneccesarry empty line
Debian: Add a description of Horde in long description
Debian: Set default horde_dir to /usr/share/horde
Debian: pearrc is not needed because horde_dir is defined in php-horde-role package
Ignore comments in package.xml, as found in Horde_Kolab_Filter

See http://bugs.horde.org/ticket/11938
Debian: Adapt Debian template for team packaging