Fixed|libdeng2|File: Retain origin feed when reinterpreting
libgui|Atlas: Disabled log entries about commits by default

Logging atlas commits is not that relevant unless one is debugging
Atlas or an atlas allocator. The commit log entries are now controlled
with a flag that is disabled by default, as there were too many of
them.
Merge remote-tracking branch 'remotes/origin/master' into savegame-refactor
libdeng2|SavedSession: SavedSession did not fulfill the File specialization rules