Resolve "Do not allow to add personal notes for cancelled lessons"

Closes #82 (closed)

restored source branch 82-do-not-count-cancelled-lessons

added 3 commits

• c1197b38 - 1 commit from branch master
• 398c6551 - Implement school term and validity range
• 3cb069cd - Remove photo cropping

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added 2 commits

• 81c3a538 - Allow setting personal notes only if lesson isn't cancelled
• 8f2ac50f - Fix lesson status icon to show cancelled icon at first

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added 22 commits

• 8f2ac50f...4a5b813e - 21 commits from branch master
• 16deaf83 - Merge branch 'master' into 82-do-not-count-cancelled-lessons

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@nik I probably need your help on this. I have no idea how to filter the personal notes correctly.

added 39 commits

• 16deaf83...69fa177d - 37 commits from branch master
• c2891c34 - Fix doubled tags in template
• 45614af4 - Merge branch 'master' into 82-do-not-count-cancelled-lessons

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added 1 commit

• 64c57bb0 - Remove legacy query

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added 1 commit

• 068a0cd2 - Reformat

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unmarked as a Work In Progress

changed title from WIP: Resolve "Do not count cancelled lessons" to Resolve "Do not allow to add personal notes for cancelled lessons"

changed milestone to %1.0a1

added part::backend label

assigned to @nik

added 3 commits

• 068a0cd2...f58a00cf - 2 commits from branch master
• 1928e6ea - Merge branch 'master' into 82-do-not-count-cancelled-lessons

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added 1 commit

• 22e3f80d - Make blocking of adding personal notes for cancelled lessons configurable

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mentioned in commit 7ee76c90

merged