Resolve "Add rules and permissions"

Closes #73 (closed)

Closes #79 (closed)

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

@yuha Please give feedback when your task will be finished.

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• e65b4cb2 - Add some more rules&permissions

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I think the persons someone can select to register an absence should be filtered according to one's permissions. @yuha

assigned to @nik

@nik Please review as soon as it's possible for you – that would be very nice. (Despite it's still WIP.)

Looks good on first glance.

However, I tend to not merge this without at least basic black/white test cases for the most important permissions.

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• e65b4cb2...a8b1b29c - 33 commits from branch master
• a85bcae6 - Merge branch 'master' into 73-add-rules-and-permissions

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• c0e47390 - Merge branch 'master' into 73-add-rules-and-permissions

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• a85bcae6 - Merge branch 'master' into 73-add-rules-and-permissions
• 451cdb33 - Merge branch '73-add-rules-and-permissions' of...

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• 2a84050c - Fix order of has_perm and perm check in lesson template

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• 45de9a0c - Merge branch 'master' into 73-add-rules-and-permissions

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• 420f07a0 - Add rules&permissions in class register template
• a95d775a - Replace ugettext with gettext

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• 2011793a - Add tooltips in alsijil_helpers.py

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