Minor fixes after regression tests.
Fixed minor regressions after testing. The fix for #2637 made the test for #2546 fail, because the year isn't dividable by weeks.
Created study file for geojson to simplify testing from the file system.
Fixed #1216 where tooltips were not positioned close to each column in groups.
Reverted previous fix to #1216, failed with columnrange
Optimized k-d-tre study
Utils: A couple of improvements