remove test_topology executable bit
make _contract return NumericArray
remove numpy occurrences
bugfix: scalar comparison
remove core module, remove all cache, rewrite glue
update unit test framework
introduce CompiledEvaluable class
introduce compilation-based caching
Merge commit '7acec38ad0ca77d8bd53c8072fa37e37f9e274f6' into sane
add git subtree command line
remove element index member
derive Transformation objects from WeakCacheObject
move all cache things to cache module
derive StdElem from WeakCacheObject