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Torrents added with previous versions of btpd will show up as "bad torrent entry"

Closes GH-26

Accept .torrent files whose bencoded dictionaries are not in
alphabetical order.

This adds a 'rate' command to modify the up and download
rates on the fly.

Closes GH-10

Closes GH-7

There was a hard-coded 2MB file size limit on the .torrent files.
Set the limit to 0 so read_file() will use the actual file size.

Closes GH-14

Applied OpenBSD patches from Nicholas Marriott.
Closes GH-12

o Added ability to set the ratio items:buckets.
o One can remove items while iterating.
o _htbl_tov now allocates the result array, _htbl_fillv acts as the old
  _htbl_tov did.

The counts are for "reachable" trackers, ie. trackers that haven't
timed out or been disabled for one reason or other.

Torrents are now considered stopped and may be restarted even if
the stop event haven't been sent the trackers yet. The same holds
for the del and add commands.

A btpd process in shutdown mode that only have stopped torrents,
but is still sending the stop event to trackers, will release
resources that would block a new btpd to start. It will the
silently exit when it's finished with the trackers.

This also makes the timeout parameter for shutdown unnecessary.

the port number.

NULL on empty lists or dictionaries. This could cause crashes.

Reported by Robert Jonsson.

callback to be called before http_get returned.

bits as well. Implement them in libmisc instead of in btpd.
o Change resume file format and related APIs. The resume files are now memory
  mapped.

o Some new source files.
o Inclusion of libevent.
o Removal of curl and pthreads dependencies.

reply.

than curl.

hierarchy to a specified torrent content directory if neccessary.

library support some day...

write performance.

make_abs_path doesn't need the directories to actually exist in the
file system.

stream abstraction skip past them.

for torrent size and amount gotten when the torrent isn't active.

'btcli stop -a'.

make it act properly on iobuf errors.

Use the fact that we only can store structs in the table to make the
complex pointer use safe. Unfortunately the equal and hash functions
need to take void * arguments.

interface.