CP2K: updated easyblock to version 20131205

Also did some indenting cleanup.
CP2K: reworked after comments in PR
CP2K: moved libxc version to a constant
CP2K: definied multicore constant
CP2K: better check for multicore in tests
CP2k: small add
minor style fixes
fix definition of test_core_cnt
revert to not including libxc support by default
drop useless libint/libxc easyconfigs parameters in CP2K easyblock
add log message for building without LibInt/libxc
make sure libxc root is available further down
fix typo
Merge pull request #336 from boegel/cp2k

update CP2K easyblock