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Fix order events in list view

Closes #304

See merge request !331

Enable TinyMCE clean on text pasting

Closes #237

See merge request !328

Add link to gitlab in footer

Closes #299

See merge request !317

Fix years in statistics

Closes #297

See merge request !330

Now uses the current lecture year instead of the current calendar year.

Validations should be a list

See merge request !323

Fix uniqueness of url namespaces

See merge request !326

This breaks Django2 otherwise

Namespaces should be unique, but we include newsletters twice.
By overriding the namespace of the urlconfig we fix this problem.

Redirect board item in menu to point to current board

Closes #302

See merge request !324

Allow board events

See merge request !322

Add vacancies to partner sitemap

Closes #289

See merge request !320

Add events sitemap to site sitemap

Closes #288

See merge request !319

Update and fix translations for events app

Closes #292

See merge request !318

Make sure models are ordered in admin dropdowns

Closes #277

See merge request !314

PDF is binary

See merge request !316

The previous commits added ordering to Members, but this ordering is
not necessarily unique. Because of this, postgres does not allow for
random access in a predictable way for the resulting queryset.

Clarify some things about settings with some comments

See merge request !315

Display correct initial join date for consecutive committee memberships

Closes #278

See merge request !313

Places like the boards page seem to use the default

Warning that full-sized photos are not saved

Closes #275

See merge request !297

This typically resulted in incorrect dates for committee chairs
who had previously been member of the committee as nonchair

Fix warning in tests

See merge request !312

By properly closing the opened thabloid file