* Make URL scheme unambiguous

Redirect old routes to new routes

* Fix redirects to new URL scheme, and update template

* Fix branches/_new endpoints, and update integration test

* Fix PR, milestone and label functionality if issue unit is disabled or not assigned to user

* Fix multi-actions in PR page

* Change error message

* Fix comment update and delete functionality in PR

* Fix search by issue type

Reported by Miguel Ángel Jimeno.

If anonymous (not signed in user) requests page
"/:owner/:repo/pulls" he gets an error:

  template: repo/issue/list:11:105: executing "repo/issue/list" at <.PullRequestCtx.Base...>: nil pointer evaluating *models.Repository.Link

This commit fixes that.

Signed-off-by: Dmitry Yu Okunev <dyokunev@ut.mephi.ru>

This commit improves templates readability, since all of them use consistent
indent with all template command blocks indented too.

1. Indents both HTML containers such as <div>, <p> and Go HTML template blocks
   such as {{if}} {{with}}

2. Cleans all trailing white-space

3. Adds trailing last line-break to each file

Merges repo/sidebar.tmpl with repo/header.tmpl and makes every repo page use
middleware.RepoRef() necessary to display information on this menu.

This is more inline with way GitHub looks like and feels much more natural and
in style with rest of the interface.

- create new label

- fix isRead check
- fix paging

Currently, the js file doesn't take into account the possibility of a sub url being used (wich is my case :) wich prevents its inclusion.