Add substition to deprecation message of level().
[CMake] Do not add dunegrid in UG/ALUGrid/ALBERTA flags.

Otherwise dunegrid would be linked to itself which is odd,
uncommon compared to other external libraries, and it leads
to error CMP0038 with CMake 3.0.0.
[CMake] Add directory test target uncoditionally for albertagrid/test

Otherwise CTest complains for a missing configure file.