preallocating disk space, etc. Tweaked the cm <-> net api a bit.

called after removing the last request.

* Move some struct and type definitions to net_types.h
* Fix ul_on_lost_peer. I must've been very tired when I wrote it :P

o Unhook cli_if.c from build temporarily. It needs to be fixed.
o Torrent meta data is now kept in subdirectories to $BTPD_HOME/library.
o Added some very incomplete life cycle logic for torrents.

Tabs have been converted to spaces and trailing whitespace have been removed.
I have fixed my emacs settings now :P

* Renamed the policy* files to upload* and download*.
* The upload (un)choker is now global instead of per torrent. The algorithm
  is not yet implemented however.
To be continued...

* Load "test" torrent on start.
* Look for content and resume in the right places.

be shared by several peers. At least in end game.
* Link blocks with the peers we are loading them from and vice versa.
* Limit the number of requests / peer in end game too.
* Improve end game by using some sort of round robin for block requests.

* Use the new net_bufs where it makes sense.
* Take advantage of the reference count on net_bufs and only allocate
  the (un)choke and (un)interest messages once.

Each piece must have at least one byte for their block bit array,
  or they will collide causing great confusion in btpd. The calculation
  was done wrong so this could happen for small torrents (blocks / piece < 8).

policy_subr.c:
  * Add test for correctness.
  * Add missing call to cm_on_piece_full in cm_new_piece.

Add test for program correctness.

so it must be bug free :)