now it compiles

Since we don't fully qualify the module names now (e.g., we import
Foundations.hlevel2.algebra1b rather than
Foundations.Foundations.hlevel2.algebra1b, it is important to remove
older directories in user-contrib named Foundations, RezkCompletion, or
Ktheory.)
Merge pull request #1 from benediktahrens/master

removed some experimental files from RC
update makefiles