Add user preference to disable showing size bars in change tables

Some users dislike the rainbow colored bars in the change tables that
indicate the change sizes. Add a preference setting to allow users to
switch between colored bars and text representation of the change
size.

Bug: issue 2299
Change-Id: I689c3cebf21252d7f70a5df1d312c179189d10fc
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
9 files changed