Auto detection of libs failed. Reverted the CMakeLists to minimal version. Kept the adjustments to Doxygen etc.

Seb
Merge branch 'master' of https://github.com/wpoely86/CheMPS2

* 'master' of https://github.com/wpoely86/CheMPS2:
  Added logo in README
  Small correction in README and Doxygen
  Improved Doxygen options
  Updated CMakeList to find GSL, HDF5, LAPACK
  Added links to README
Fixed bug in finding the HDF5 libs
CMake now searches for libraries