Revert "explicit aspect activation"

Unfortunately, this does not (yet) work as advertised.  I need to fight another
round of CMake battles before retrying.  Reverting to previous state for now.

This reverts r1753.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1767 8c4709b5-6ec9-48aa-a5cd-a96041d1645a