A small fix belonging to #2531.
During the sorting empty QDateTime values are shuffled around due to
unstable sort in QSortFilterProxyModel (see #2526 and #2158), causing
the transfer list items to constantly change order.
Fixed by using an already existing correct comparison (with a torrent
hash fallback).
The current sorting algorithm is not stable and causes undesidered
rearrangements of the transfer list when different torrents have same
values in respect to the current sorting criterion. Fix this by using
the priority, the seed date and the hash of the torrents as fallback
values to determine the order.
Closes#2158.
Closes#2526.
Change project directory structure according to application structure.
Change 'nox' configuration option to something more meaningful 'nogui'.
Rename 'Icons' folder to 'icons' (similar to other folders).
Partially add 'nowebui' option support.
Remove QConf project file.
