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

Closes GH-26

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

Closes GH-10

Added printf()-style '%' and '\' sequences for custom list formats.
Updated btcli manpage to reflect change and start -a.

Closes GH-8

Modified patch from savrus and nicm.
Allows adding multiple torrents from one 'btcli add' command.
Also made minor improvements to add code.

Closes GH-9

Closes GH-7

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.

Such torrents were saved as 'name/name' instead of 'name'. The option broke
in rev253.

Patch from borg@uu3.net.

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

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.

'btcli stop -a'.

improved error output.

not need to know about the sample time.

instead of megs. Similarily, display rates >= 1000kB/s in MB/s instead of
kB/s.

make it act properly on iobuf errors.

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.

add   - adds a torrent to btpd's library
del   - removes a torrent from btpd's library
start - activates a torrent from the library
stop  - deactivates an active torrent
tget  - get data from torrents

tget obsoletes stat and list.

Commands for setting values and query other data will be
added later.

the percentage upwards. Ie. Display 99.9%, not 100.0%, even if we have
99.98% of the content.

1. Show the number of torrents with tracker errors on the total status line.
2. Show the torrent status character on the status line instead of the name
   line. This only has effect when the '-i' flag is given.

may fail if the last path component doesn't exist.

characters displayed by btcli.

torrents.

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 :)

o Lot of work on the cli and its communication with btpd.

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

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.

instead of the ideal.