* Added a thread and api for http requests. The thread uses the curl multi
  interface and will be used by the tracker code. The tracker code currently
  use forked processes to do its bidding.

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.

pieces we and blocks we have, it'll do the writing and reading from disk
and test pieces against their hashes.
This is only a dummy implementation of the api. I'll flesh it out in
subsequent commits.

unsigned when I wrote it :P

o Made bit field argument to has_bit const since the function
  doesn't modify it.

was done per torrent.

* Add net_active flag to simplify removal of peers when shutting down the
  net for a torrent.

removed in a previous commit. Fix indentation.

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

and net_del_torrent does the opposite (surprise!).
* Some code shuffle has been done to separate net_ and dl_ from torrent_
  but there's still much to be done.
* Removed a couple of dead vars from struct torrent.

* 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...

* The peer rates are now only updated when data transfer is enabled
  in the corresponding direction. They are also computed differently
  from before. The rates are computed in the bw callback once a second.
  This facilitates later improvements in the choke algorithm.

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

message when we no longer have any pending requests. This fixes a bug
where two uniterest messages were sent to a peer that was no longer
wanted in endgame.

rid of the global btpd struct. Some fields in the struct got a corresponding
global variable whereas some was made static and moved to a module.

The bandwidht algorithm also got tweaked. It now tries to fire the event
at specific times. This was to make the code simpler. It'll probably have
to be tweaked again :P

First step to make btpd run from a directory where it'll keep the log,
socket, configuration, data on the known torrents, etc. Btpd now uses
flock on the pidfile instead of connecting to the socket in order to
be reasonably sure that no other btpd runs in the same directory.

before we read the piece data. This can be used to test for junk earlier.

sending an uninterest message.

requests were sent.

Use the net_state enum and change some state names from NET_ to BTP_.
Some minor type fixes.

Remove unneccesary use of struct io_buffer.

Remove an unneccesary net state.
Pass the char buffer directly to net_state instead of struct io_buf.

removed some deug logging.

that had closed the at least one direction of the connection. That feature
was probably unneccesary. Removed it for now.

It's not quite how I want it yet, but it's getting there.

message followed by an interest message. Optimize this but not sending
those messages in that case. This is better becasue we don't risk to
trigger a choke from the receiving peer.