Handle metadata-only changes in Git (closes bgo#655315)

In situations where a file has a metadata-only change (e.g., mode
changes or empty file creation), Git's diff consists of an empty
patch preceeded by several lines of metadata. In the end, this ends
up as an invalid patch that won't apply, leading to the dreaded
Patch Failed Box of Doom.

This commit adds pruning of metadata from git-generated diffs, makes
sure that an empty-of-content git diff results in an actually empty
patch, and changes our git plumbing queries to parse out permission
change information so that we can show it in the UI.

With this change, we're abusing the "Options" column in the VC UI to
show essentially random extra information. However, reworking that UI
so that it makes sense across VCs is a huge project, and Git doesn't
otherwise use the "Options" column.
Updated POTFILES.in
Updated Polish translation
Updated Slovenian translation
Updated Spanish translation
Make desktop entry comply with freedesktop specs (closes bgo#686978)
Updated Czech translation
Rename Bazaar-NG to Bazaar

Bazaar hasn't existed since 2005, and no-one actually uses the suffix
anymore.
Remove long-obsolete bug workaround
Remove the 'Add binary' command, used only by CVS

CVS servers can be configured with relatively sane defaults, or the
issue can be dealt with from the command line. This command was taking
up menu and toolbar space for the benefit of a single, increasingly
unused version control system.
Use a MsgArea to report patch errors while trying to get a VC diff

The old patch error dialog tended to result in mailing list spam with
insufficient details; this way at least the spam will go to bugzilla.
Also, this patch separates the cases of not having patch installed from
the case of the reverse patch not applying.
Updated Spanish translation
Updated Slovenian translation
Add indicator to show wrapped search in Findbar (closes bgo#647687)

Added an image and a label that pop up if a search hits the
bottom of the file and continues at the beginning. This implements
a very basic notificaion that is somewhat similar to those known
from Firefox or similar programs.
Fix some sensitivity setting in no-document cases (closes bgo#682162)
Updated Czech translation
Updated Slovenian translation
Update NEWS
Pre-release version bump
Updated Serbian translation