Selection and perturbation work. Introduced new tests.
Merge branch 'master' of github.com:LCPQ/quantum_package

Conflicts:
	src/CISD/README.rst
	src/CISD/SC2.irp.f
	src/CISD/cisd.irp.f
	src/Dets/README.rst
	src/Dets/determinants.irp.f
	src/Dets/slater_rules.irp.f
	src/Perturbation/README.rst