Metalinks Code

Checked in segmented download code that works, need to add a few more features before making it the default

Updated segmented code to use threads instead of asyncore, looks like things are working better

more updates for segmented downloads

added some skeleton code for segmented downloads

Updated version number contstant

Added support for checking the file size on FTP servers

Added todo
Some patches to the hashing system, should include PHP metalink library the next time.

Added XML parse error clarification

Added version information in preparation of packaging.

Bugfix update for when size is not present