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

Closes GH-10

It sorts by name instead of number (should probably add options for sorting).
It now also takes torrents to list as optional arguments. Added ratio to
btcli stat display. Changed the help text for both commands. Some code shuffle
and other tweaks.

improved error output.

The add and del commands adds or removes torrents from this library.
The start and stop commands are used to active or deactivate torrents.
Also, a mechanism for qeurying data on torrents has been added. It's
only used by the btcli list and stat commands yet though.

btcli has been split into different files for each command.

Both btpd and btcli now use misc/btpd_if.h for all ipc definitions.

Misc changes:
- struct metainfo is gone. Use the new mi_* functions.
- Add printf format type checking where appropriate.