Merge pull request #309 from QuantumPackage/dev-stable

Dev stable

Merge pull request #297 from QuantumPackage/dev-stable

Dev stable

fixed array size

ban excitations that don't conserve momentum

fixed incorrect function call

added provider for total ref bitmask energy (with nuc. repulsion)

fixed array assignment for complex nos

more information printed in case of error

converter fixes

Merge branch 'features_kpts' of github:QuantumPackage/qp2 into featur…

…es_kpts