Clang build fix.

No need to translate in X direction

Move test environment sources to a separate folder.

Increase group padding to make space for hidden connection marker.

Update localized strings.

NSImageContext

Minor modification.

Use float literals when comparing float numbers.

Connection line disappears if the x coordinate of the end point is lo…

…wer than the x coordinate of the start point kovacsv#10

A cubic Bezier curve is completely contained by the bounding box of its control points.

Minor modification.