Resolve "Link data to school term"

Closes #40 (closed)

added part::backend prio::1 type::bug type::feature labels

added 4 commits

• 79060a31 - Add model and managers for school years
• 3dbb5980 - Add views for managing school years (including permissions, menu entry and form)
• d75341a5 - Add some mixins for class-based views and school years
• 819d1e4c - Add optional school year relation to group model

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As it's a conceptual difficult issue, the code I produced isn't as perfect as it could, so I need some extra feedback.

unmarked as a Work In Progress

assigned to @nik

added 6 commits

• 819d1e4c...32460cd7 - 5 commits from branch master
• bf877b2d - Merge branch 'master' into 40-link-data-to-school-term

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SHould we call this school year, or rather school term?

added 1 commit

• 1ff058b8 - Apply suggestion to aleksis/core/models.py

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added 1 commit

• d7842202 - Delete wrong queryset

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Thanks

changed title from Resolve "Link data to school year" to Resolve "Link data to school term"

added 17 commits

• d7842202...94f66037 - 14 commits from branch master
• 53c8a819 - Rename school year to school term and fix permissions
• 387335a7 - Merge branch 'master' into 40-link-data-to-school-term
• 38e6974d - Reformat

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resolved all threads

added 1 commit

• beeda892 - Apply suggestion to aleksis/core/mixins.py

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enabled an automatic merge when the pipeline for beeda892 succeeds