by caching results and storing them in a hash the results should
flow faster, a limit should probably be set on this but for now
there isn't. exists() and realPath() now cannot be called without
object!
this saves 2 stat system calls for every config object created but
is not a complete overheath reduction I belive because there are
enumartors and other code related to globals that I'm afraid to
touch because I'm not very familiar with the configs code. needs
a review.
for compatibilty reasons automoc4 support is not removed but it
shall be in the future. automoc4 has not been maintained for a
while (last commit is from 2011) and the stable release is from
2009.
CMake version >= 2.8.6 provides the functionality for mocking so
I see no reason to not make use of it.
