csg_inverse: allow overwritting on simprog functions (fixes issue #164)
csg_inverse: allow overwritting on simprog functions (fixes issue #164)

vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg,vaidyanathanms/votca.csg