Merge branch 'fix-attach-operators' into develop
Fix typo in test case
Update documentation to new API
Adapt unit tests to new API
Adapt changes to API

Use character strings instead of unparsed identifiers to specify the
module name in `import`, and use `/` as the submodule separator instead
of `.`.
Add missing operators to automatic export
Merge branch 'fix-operators' into develop
Merge branch 'api-revamp' into develop
Merge branch 'develop'

Changes to the core API
New version for new API
Merge branch 'develop'
Update documentation