[matter] merge_list could be None, make sure it never is
Release Entropy 271
Tagging Entropy version 271
Release Entropy 272
Tagging Entropy version 272
[entropy.server] correctly generate extra_download URLs
Release Entropy 273
Tagging Entropy version 273
[Rigo] require Gtk+ 3.10 and solve all deprecation warnings related to Gtk*Box
[entropy.server.interfaces.mirrors] simplify local packages calculation methods
[entropy.server.interfaces.mirrors] speed up _calculate_local_{upload,package}_files
[entropy.server.interfaces.mirrors] fix _calculate_remote_package_files wrt separate package dirs
Release Entropy 274
Tagging Entropy version 274
Merge remote-tracking branch 'upstream/master'