closes #8304

closes #8037

closes #8303

It makes more sense to allow to structure and group accessors how it
makes sense in the code instead of enforcing it to be grouped in a
specific way.

closes #8299

fixes #8139
closes #8242

Also backported from #7660

Also backported from #7660

diaspora should send AccountMigration message back when a federation message received for a moved account

I use Senya's Patch for this
The extra check is for satisfying tests, which don't create real database objects.

fixes #7902
closes #8288

fixes #7960
closes #8277

Splitting stripdown and markdownify options, because the footnote option seems to let the Redcarpet::Render::StripDown function crash

I think this is a leftover from a long time ago and I can't find
anything that still uses that

closes #8280

closes #8287

Person.find_or_fetch_by_identifier raises an exception if person is not found localy and not fetchable. It never returns nil. These code changes take care about this behaviour and changes specs and code to behave equally.

Also related to #8253

closes #8268

Using galleries default border radius Small indicator images in image gallery are round ones, this doesn't correspond with preview shown in stream. It also doesn't look good on real-world images. (may look OK for User profile images)

closes #8275

closes #8276

closes #8267

This reverts b3ca504c. We don't quite know why that was added, but we assume it's because of format strings. Some pre-2011 users exist that still have dots or dashes in their username, and those accounts are somewhat broken now.

closes #8266

The chat is already removed for 0.8, so there is no need to still export
this data since it can't be imported anyway.

Related to #8069

closes #8265

closes #8263

Gem updates

closes #8262