fix handling of NULL values
bump version to 1.1.1
Merge branch 'release-1_1_1'
makefile updates
more fixes for NULL handling
fix error when there is no selection in input layer but statistic on
selected features requested
strings update
ukrainian translation update
bump version
Merge branch 'release-1_1_2'
fix issue with overlapping titles
bump version
strings update
Merge branch 'release-1_1_3'