Another step closer to Green's functions
Merge branch 'master' of ssh://github.com/SebWouters/CheMPS2

* 'master' of ssh://github.com/SebWouters/CheMPS2:
  Doxygen should now be OK
  Prelude to FCI Green's functions

Conflicts:
	CheMPS2/FCI.cpp
	CheMPS2/include/FCI.h