Resolve "[Week view] Admin can see only their own person in teacher select"

Closes #102

See merge request !130

Update poetry.lock

See merge request !129

Bump version to next dev cycle

See merge request !125

Release 2.0a3

See merge request !124

Merge branch '125-alsijil-personalnote-extra_marks-fields-w340-null-has-no-effect-on-manytomanyfield' into 'master'

Resolve "alsijil.PersonalNote.extra_marks: (fields.W340) null has no effect on ManyToManyField"

Closes #125

See merge request !123

Fix testsuite

See merge request !121

Resolve "`aleksis-admin yarn install` needs a database"

Closes #126

See merge request !122

Closes #126 — module loading must not have side effects, and
generating the predicates calls the database.

Under normal operation, cache_memoize and/or django-cachalot ensure
the database lookup is not done on every permission check.

Resolve "Add task for checking plausibility of data"

Closes #91

See merge request !92

Update tox.ini. Advances AlekSIS-Core#338

See merge request !119

Update tox.ini. Advances AlekSIS-Core#338

See merge request !118

Update poetry.lock

See merge request !117

Resolve "Add never_cache decorators"

Closes #90

See merge request !116

Resolve "Do not allow entries in holidays (configurable)"

Closes #112

See merge request !101