#10 Tracker scrape info

[Leon Kos]

This patch enables tracker scrape.php parsing for
downloaded torrents. It reports number of seeders,
leechers and downloaded torrents from tracker with
command line option -s when calling btlist on torrent file.

Tracker info is retrieved with curl_easy from announce
URL. Not very efficient way of searching for hash info
though.

And types.c is patched for NUL string compare, which
can be considered as a bug in btString_cmp().

[Leon Kos]

Traceker scrape info patch for btlist