Soft delete issuables
Fixes#2489
What still needs to happen: research on the indexes, the gem suggests a [lot of changes](https://github.com/rubysherpas/paranoia#about-indexes) though this is probably a good idea to discuss and I'm unsure on the impact of an omnibus upgrade as I suspect creating about 10 new indexes has a large impact on the downtime.
TODO:
- [x] Also group owners can ***soft*** delete
- [x] Button should be hidden
See merge request !2982
Improve performance of viewing individual issues
This MR does two things:
1. `Issue#related_branches` no longer performs Git operations that aren't needed
2. The output of `Repository#exists?` is now cached and flushed properly
Combined these two changes should further cut down the amount of Git operations performed when viewing individual issues (and possibly other pages).
See merge request !3296
Safari 9.0 does not yet honor the HTML5 `origin-when-cross-origin` mode,
and it's possible load balancers/proxies strip the HTTP_REFERER from
the request header. In these cases, default to some default path.
Closes#3122
Closes https://github.com/gitlabhq/gitlabhq/issues/9731
Change "+" icon under "Files" section to have three options:
* Create file
* Upload file
* New directory
Upload file is no longer accessible from the "Create file" page.
Users can now select a target branch in upload file as well.
Closes#2799: Fixes a bug where file modes were overwritten after a commit
Closes https://github.com/gitlabhq/gitlabhq/issues/8253: Existing files
can no longer be overwritten in the "Create file" section.
Closes#2557
for posterity.
Also fix issue where destroying a Milestone would cause odd, transient messages like
"created milestone" or "imported milestone".
Add "in" preposition when creating and destroying milestones
Closes#2382
Add Content-Type header to fix a bug which IE can't show image in
markdown when the image is from raw.
modified: CHANGELOG
modified: app/controllers/projects/raw_controller.rb
modified: spec/controllers/projects/raw_controller_spec.rb
Disable internal issue tracker if external tracker in use
### What does this MR do?
This MR disables routes to the internal issue tracker if an external issue tracker (e.g. Redmine) is in use. A 404 page is returned if a user attempts to access any of the issue routes.
### Why was this MR needed?
Enabling the external issue tracker would still keep the internal one active, which would lead to odd behavior where users could create issues but not close them.
### What are the relevant issue numbers?
Closes#2006
See merge request !993
Douwe MaanandRémy Coutable
Robert SpeicherandRobert Speicher
Zeger-Jan van de Weg
Zeger-Jan van de WegandZeger-Jan van de Weg
Jacob Vosmaer
Rubén Dávila
Douglas Barbosa Alexandre
Marin Jankovski
Stan Hu
Minsik Yoonand윤민식
Valery Sizov
Francesco Levorato
pilsner
Dmitriy Zaporozhets