Also fixed up a few problems with the hash table.

Also switched to BSD license. Licensing was in limbo for a while 'cos I didn't feel comfortable with GNU Public License restrictions. BSD as I understand it allows anyone to use the library as they please for any reason(including commercially). The project is still in a very early stage and has experienced only 30 odd downloads so I don't think there is any issue with changing the license. Has anyone every read this anyway?