This will unify 7z loading in all scenarios and it also fixes the search path in Linux, now the apps will always try to load 7z.so from LIBDIR/yacreader/7z.so, if it fails they'll try 7zip/7z.so
A comic always belongs to a Folder, but when we open one its siblings may be different in we are opening it from a Reading List. I am not sure that Tags should keep the reading order because their purpose is abstract, so their behaviour will be opening the comics from theirs container folders.