Update window title when application is activated.

Variables customizing `windowTitle` such as `$TM_SCM_BRANCH` can change while TM is inactive, while user is working in command line or different app. So it is better to refresh `windowTitle` once we get back to TM.
New `TM_SCM_NAME` variable

This can be used together with `TM_SCM_BRANCH` to customize `windowTitle`.
Find dialog’s Find All for untitled file caused crash

Closes issue #318.
Checkin release notes
Link with -fobjc-link-runtime for arclite
Assume compiler support for explicit keyword

Since we require a fairly recent clang for other features, there is no reason to test for this one.
Use initializer list syntax
Fix missing svn status for long committer names

* Changed the Subversion status command to output XML
* Updated the status parsing to handle new XML output
Fix/change path::with_tilde

We now leave a potential trailing slash in the result.

This fixes the issue of the missing slash in ⌘T — while I normally prefer the slash to be stripped, I think path::with_tilde should be an exception since effectively it is just replacing the path prefix, it shouldn’t do any real processing (although we do actually normalize the string).

Also fix a bug where we would use tilde for paths pointing to a user folder for a user with current user’s name as prefix.
Remove compatibility checks

Since we now require 10.7 we don’t need all of this. Keeping it around is just noise that can lead to confusion about code paths.
Show alert if readlink fails

I am seeing crash reports from resolve_links and I can’t think of any other reason for this crash, than readlink() returning a value which is neither -1 nor in the range [0..len].
Use NSDictionary instead of retained_image_t

The main reason for this is that we wish to resize the images when the font is changed. This can now be done in the gutterImage: method.
Change how we render gutter images

Previously we would lock focus on our source image. This is bad because we do rasterization (to a fixed pixel format / density) and it (potentially) destroys / mutates the source image.

We now use a second (new) image for the compositing. This is still not ideal, as this second image still is “off screen” so lack the proper graphics context during rendering. A better approach might be to create a CGImage using the graphics context and use that as an (image) mask and do a stroke, but this would require the images to be changed and I am not really certain it will work.
Remove automatic resizing from gutter view

There is a somewhat frequent crash caused by infinite “did resize” notifications. It’s unclear exactly why this happens, but basically a subview shouldn’t resize itself unless asked, and it shouldn’t resize siblings either.

We now have an explicit sizeToFit which takes care of sizing the gutter view. It is the responsibility of the owner (of this gutter view) to resize the gutter’s parent scroll view and any siblings that may need adjustment (after calling sizeToFit).

Additionally it is the responsibility of the owner to call sizeToFit when there is a chance the gutter view size needs updating. Generally though, the owner should know, as it is the data source for everything.
Update gutter images
Remove pointless indirection
Limit amount of refresh

In theory there should be no reason to redraw more than the divider line and the gutter, after changing gutter styles.
OakDocumentView now manage gutter’s size
Gutter: Don’t draw same row rectangle twice

Incase the last line of a file is folded (has no newline) then the gutter would first receive a row record for the line starting this fold, and then when querying for the next row, it would get the last line of the layout, this had a different line number but shared same coordinates as the previously rendered line, so the gutter would draw on top of that.

Closes issue #256.
Don’t refresh gutter from OakTextView

I suspect that this was added because some operations were not properly detected, though the only thing I can find, that doesn’t properly update the gutter, is when deleting folded code in a way that doesn’t change the bounds of the text view. This code however does not address that issue.