Don't show "Add comment" button if not logged in

This is for file upload reviews. Before, the button was there, but did nothing
for anonymous users. Also, fix some template tag indentation

Testing done: Checked if the button is gone for anonymous users and still there
for logged-in users. No failed tests.

Reviewed at http://reviews.reviewboard.org/r/3773/
Fixed bug allowing a request to be published with empty summary fields.

In the publish request page, if you filled the summary or description field then
deleted the contents, the fields would not be updated but the ReviewRequest
object would be updated.  This allowed a request to be published with empty
fields although the page showed they were not empty.

The fields are now emptied to then be filled with the new contents, avoiding
this issue.

Testing done: Checked in browser that the summary and description fields are
updated if you empty the field.  The Web UI does not allow the request to be
published after the field is emptied.

Reviewed at http://reviews.reviewboard.org/r/3760/
Fixes bug 2870.
Support localized revision strings in svn diffs.

If the host is running in a non-C locale, 'svn diff' will produce a diff with
the revision strings localized. Unsurprisingly, this would fail to parse
correctly. post-review already handles this by always invoking svn with LANG=C,
but if someone uploaded a diff manually, it would still break. This change adds
all the different localizations of "revision" to the regular expression that we
use for parsing.

Testing done: ran added unit tests

Reviewed at http://reviews.reviewboard.org/r/3749/
Fix "Review ID" column in the dashboard datagrid with a local site.

The review ID column would properly select which database field to access,
except DashboardDataGrid was popping the "local_site" value out of kwargs before
delegating to ReviewRequestDataGrid.

Testing done:
Created a local site and published a review request to it. Before this change, I
saw a review ID of "5" even though the URL was /s/test-site/r/1/. After this
change, saw a review ID of "1" in the dashboard.

Reviewed at http://reviews.reviewboard.org/r/3786/
Fix "Review ID" column in the dashboard datagrid with a local site.

The review ID column would properly select which database field to access,
except DashboardDataGrid was popping the "local_site" value out of kwargs before
delegating to ReviewRequestDataGrid.

Testing done:
Created a local site and published a review request to it. Before this change, I
saw a review ID of "5" even though the URL was /s/test-site/r/1/. After this
change, saw a review ID of "1" in the dashboard.

Reviewed at http://reviews.reviewboard.org/r/3786/
Merge branch 'release-1.6.x' into release-1.7.x
Send email when closing review requests

Optionally send emails when closing review requests. Add a flag in the Email
settings page that will allow for sending emails when a review request is closed
(Submitted/Discarded).

Files Changed:
reviewboard/admin/forms.py
+ Added Boolean to store the value of "mail_send_review_close_mail" in settings

reviewboard/notifications/email.py
+ Added callback method for review_request_closed signal

reviewboard/templates/notifications/review_request_email.html
reviewboard/templates/notifications/review_request_email.txt
+ Added code to display the "Status" of the review request when it's closed
  before the "Description" section.

Tests:
+ Added test for review request closing
+ Modified other review related tests to fix counts or expected results

Testing done: Added test for this feature and ran all tests. Verified in UI.

Fixes bug 422
Reviewed at http://reviews.reviewboard.org/r/3707/
Add a capability to indicate support for Perforce moved files.

1.7.2 introduced moved file support for Perforce, but there wasn't a
good way for RBTools to really detect this that retained compatibility
with previous versions of Review Board. The reason is that we relied
upon the existing general diffs.moved_files capability, causing RBTools
to generate diffs for older releases that ended up being incompatible.

This introduces a scmtools.perforce.moved_files cap that can be used
instead. 1.7.3 will be the minimum version of Review Board that will
support moved files for Perforce with RBTools.