Unify

Related issue: #5 (closed)

Summary for this MR:

• GPG now check for key size and type
• GPG tests use newer version for keys (ed25519)
• Activation for the route '/packages/{filter}/{id}/feed'
• Tests for the feed route
• /!\ Task job modified for debexpo_worker. importcomments replaced by removeolduploads
• Minor tweaks (/usr/bin/env python and closedbug not tested)

Merges remaining: 212