update ace-evaluator (download link + md5sum in cmake and make build systems): accept multilines comment at the beginning of potential.ace file
add first comment line for potentials/Cu-PBE-core-rep.ace
- no auto-download of user-pace src yet
- lib/pace/*.cpp,*.h are provided explicitly yet.
- implement CMake integration in USER-PACE.cmake and in CMakeLists.txt