Change Size column to show +X, -Y instead of a bar

Users hate the colored bar. It is inappropiate for a tool to be
deciding some changes get green bars and others get red bars.

The decision for the bar to be full width at some line count is
arbitrary and does not reflect what individual users think to be
a reasonable size change. Reasonable sizes can even vary between
projects on the same server.

Get rid of the bar and simply display "+X, -Y".

Change-Id: I3e3ff82dcb734f52b92cb1720b3f3f51ac119991
1 file changed