forward to v3.0.2

Merge pull request #143 from scqubits/devel-sai

Pushing final changes into master for release 3.0.1.

remove superfluous imports

forward to v2.2.2

fix packaging bug (missing directories in wheel)

forward to v2.2

forward to v2.1

forward to v2.0

forward version to 1.3.2

version 1.3.1