Display the size of a patch (lines added/removed)

In a patch table we now display the number of new lines added or the
number of lines deleted for each file, assuming it is not binary.
Added files only show the total number of lines, while deleted
files show nothing at all.

A new row is added at the bottom of the table that shows the overall
size of the delta.  This can be useful if a project has rules about
how big a patch can be before additional types of review are required
(e.g. Eclipse based projects).

Bug: issue 499
Change-Id: I961d8fac3f5d82a5d24f0a4d0b0a9ddf39182a50
Signed-off-by: Shawn O. Pearce <sop@google.com>
13 files changed