Resolve "Remove token-based filenames for generated PDF files"

Closes #449

See merge request !617

Fix pre-migration errors due to not available tables etc.

See merge request !613

Remove legacy file upload function

See merge request !614

Update lock file to get haystack-redis back to upstream

See merge request !616

Resolve "Unavailable Redis hangs login request"

Closes #394

See merge request !552

Resolve "Rely on object permissions for search index"

Closes #363

See merge request !591

Merge branch '363-rely-on-object-permissions-for-search-index' of https://edugit.org/AlekSIS/official/AlekSIS-Core into 363-rely-on-object-permissions-for-search-index

Resolve "Update copyright"

Closes #446

See merge request !607

Resolve "Rename rules to allow differentiation from permissions"

Closes #448

See merge request !611

All file-handling code is required to use the storage API.

Reformat

Resolve "Favicon code regenerates favicons on every load"

Closes #447

See merge request !612

Resolve "Prevent deep linking to media files"

Closes #376

See merge request !610

Resolve "AttributeError at /data_check/ for datachecks from uninstalled apps"

Closes #442

See merge request !609

This ensures links to media files are only valid for a short period of time,
much like when using an S3 CDN server.

Closes #376