This update adds Vertical Flip and and new replace terrain function. To replace a terrain press shift+r and the click on the terrain (ground or wall) that you want to replace. That terrain will be replaced on the entire level.
Changes
New fill feature, Press shift+r for replace.
Vertical Flip feature added
Flipping now also handles diagonal walls correctly
Flipping now also flips icons properly
--noglfinish is now the default (start with --glfinish for old behavior)