Maintenance release

Import sped up by importing 3dplot in function call rather than at module top. Credit @fiendish
No API changes.

Maintenance release adding support for 3.11 (fixes empty package)

Fix for empty package.

Maintenance release adding support for Python 3.7 - 3.11

There are no API changes.
Only added support for python 3.7-3.11

Maintenance release adding support for 3.11

No changes. Only support for python 3.11

Maintenance release adding support for 3.11

No significant changes.
Added support for python 3.11