Add new keybinding 'N': Start torrent now

This performs the RPC request "torrent-start-now", which allows
starting torrents even if they're currently in waiting state due
to full download queue.
Implementing tab complete for torrent search.
Changed peers' column width in minimalist torrents' view.
Show creator in torrent's details
Show Transmission version in top bar
Make pausing all torrents faster
Release version 1.6.3
Merge https://github.com/fagga/transmission-remote-cli

Merged upstream changes.