has moved toward btpd having a library of torrent to wich one may add
or remove torrents, and where interaction on torrents are done by their
assigned number. This commit is a step back from that and it makes life
simpler and better for all :)

* Some options to btpd has changed:
  --no-daemon is the old -d.
  -d is now used to specify the btpd directory.
  --logfile option is reintroduced.
* The ipc code has been improved on both btpd and cli sides.
* All commands have been implemented.
* Various improvements in btpd.

With this commit we're very close to 0.8 :)