Merge branch 'feature/fix-staticcheck-subindex-codim' into 'master'

Fix codim for subIndex() method

For an entity e with codim=cc subIndex(e,i,codim) is only
available for cc<=codim<=dim. Instead of checkoing for codim=0
we now check for all codims in this range.

This fixed an issue mentioned in #37.

See merge request !115