save screenshot works except for text items, 3 frams shows features not visible on screen. Sources put back as interim measure

unsorted featuresets on new feature added to try to fix overlap bug - displayed format is now stable from first display. Difficult to test as cannot create overlap on demand

replaces the floating groups/text I did in foo canvas dirs

compiler warnings fixed

fix issue with cropping and initial scroll region
utilise flags in update cycle for reposition and crop
reinstate some of old container functions

sub classing foo canvas...