Merge pull request #700 from peircej/master

BF: linux issue with wx3.0 and drag-drop of files onto coder
BF: fix bug in textbox import exception handling ;)
Merge pull request #701 from isolver/master

BF: fix bug in textbox import exception handling ;)
RF: rename private function Window._warp() to Window._renderFBO()

It isn't warping per se, merely rendering the framebuffer object which
allows us to do warping at the same time if needed.