rss4linux 0.31 released

This release added support for more than one channel.

I also decided to save the channels in a simple array instead of a sorted binary tree since it doesn't really affect performance but makes the code a lot easier. To see the other changes lokk at the git repository at http://rss4linux.git.sourceforge.net/git/gitweb.cgi?p=rss4linux/rss4linux;a=summary