Fixed: Pickle.save is supposed to wait for futures.

And no, it is not supposed to wait for variables.
Removed the export of 'Base' in the base env.
Fixed a warning in Init.oz.
Fixed Pickle to raise an exception on finding a resource.
Added properties as a source of info in Prop.oz.
Updated for the new bootcompiler that wants Base as argument.
merge
Merge branch 'master' of git://github.com/mozart/mozart2-library
Merge pull request #4 from sjmackenzie/master

upstream merge