Set Dir::Etc::SourceParts empty to avoid using host sources.list.d

See merge request trisquel/package-helpers!228

Update helper for quassel for etiona

See merge request trisquel/package-helpers!227

Liferea changes for etiona

See merge request trisquel/package-helpers!225

Fix apache2 package-helper for etiona

See merge request trisquel/package-helpers!226

Remove mate-tweak helper, old patch now in upstream src

See merge request trisquel/package-helpers!224

This adds the md5sum for index.html into the check that is now done in the
debian apache2.postrm script.

 - No need to modify desktop file, previous change is present by default
 - Upstream + debian patches already remove mozilla reference
 - Modify patching for default feeds list

Etiona package helpers

See merge request trisquel/package-helpers!222

This reverts commit 9f09f055.

Etiona package helpers

See merge request trisquel/package-helpers!219

This reverts commit 5dcedc2f.

remove uneeded replace

Trisquel studio backports

See merge request trisquel/package-helpers!218