Add baselines

Change-Id: I3878cd58ac694da72e8e1f164cfbbb5e3700904b
Merge topic '14789_fix_border' into next

e2116f69 Add baselines
BUG #14789: Added ability to save images with border betn views.

There're new settings under "Settings | General" in "Screenshot Options"
group that allow users to pick a border and color for the border to use
when saving screenshots. (By default, the border width it set to 0
pixels).

Updated LoadStateMultiView test to also test this new border
functionality.

The implementation extends vtkSMUtilities::Merge() to add a border as
images are merged. The border is added as an overlay rather than my
offsetting images so that we don't need to jagged edges or having to
resize views.

Change-Id: I1a7baa15e5756baec918629b875d6e26bd027168
Merge topic '14789_fix_border' into next

4ff73a06 BUG #14789: Added ability to save images with border betn views.