GObject-derived wrappers are used for tr_handle_t and tr_torrent_t.
Use bencoding to store prefs and state file.
Make sure to always group error messages when adding multiple torrents at once.
Remove some unused code.
Many miscellaneous cleanups.
transmission-gtk instance.
Try to add any filenames found on the command-line, using IPC if
transmission-gtk is already running.
Some minor code cleanups.
Remove lockfile on a normal exit, justfor the sake of being tidy.
