Fix critical bug where Notes content was lost when using multiple lines.
Update README.md for critical bug fix.
Bump up version to 1.7.
Add onclick for the modal overlay which sometimes used to block the complete ChRIS application when an XTK preview failed.

Now this overlay can be hidden with a click.
Fix all missing gfx errors in the console.
Fix resizing issue when window height is so small that the statistics panel is hidden.
Update changelog.
code cleanup before merge to master
more cleanup
Merge branch 'master' into interactive_plugin