[MERGE] add modification dates to diff output, get rid of /dev/null (bug #43033)

[James Henstridge]

I posted this patch a few days ago, but have updated it with a few
more tests, and think it is ready to merge.  The branch is available
here (currently at revision 1712):

    http://people.ubuntu.com/~jamesh/bzr/bzr.diff-output

The branch addresses bug #43033, making the following changes:
  * add a get_file_mtime() method to RevisionTree and WorkingTree
 * make _show_diff_trees() include dates in the new/old labels passed
to the diff method.
  * for added or removed files, use the same file name with the epoch
date as a label rather than /dev/null.

This gives output more similar to other version control systems, and
stops diffstat from getting confused about added/removed files.  By
using the epoch date for removed files in diffs, patch will remove the
emptied file as it does currently.

James.
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