Package lock fix and OR patterns

Hello,

While trying to load CVS Lisa into SBCL it gave me package-lock errors, so I
started reading the code to try and fix that. When I was doing I also noticed
that OR patterns from previous versions are no longer present, and added them,
if in a bit hackish way. I also made few other small changes. I published them
in a git fork at http://github.com/Ramarren/lisa/tree/master . 

Since I don't have any project which could actually use such a system I can't
really do any serious testing, but I hope this will be useful for somebody.

Ramarren


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