Used better words
Merge branch 'Issue845' of github.com:acquaman/acquaman into Issue845
ADDED:
Second curveSmoother variable and
REIXSXESImageInterpolationAB::setCorrelation2Smoothingto() method to
allow each curve to have a different smoothing applied.

MODIFIED:
computeShiftMap() to store a local copy of the last shift map and added
REIXSXESImageInterpolationAB::shiftValuesAt() getter to allow the editor
to access the shift map.

ADDED:
onCorrelation2CenterBoxChanged() to properly hand two correlation
regions. And REIXSXESImageInterpolationABEditorShift1Model and
REIXSXESImageInterpolationABEditorShift2Model helper classes to provide
plotting data for both correlation regions and the shift map.