This is equivalent to the cache.lib, not the real one.
We can generate two versions, one normal and the other with crossed
components.
Now we need a schematic to use them.
Files using macros can't be cached. Now if we find caches for them we
try to delete the caches (pypi installation for example). If we can't
remove the files a warning is generated.
If we fail to load a plug-in an error explaining it is generated.
Also added a test to reproduce it.
Salvador E. Tropea