Back from holidays...

I'm back and working on L3DT again. Some of the activities include:

• Fluvial erosion is finally working. It's fairly quick (ie. bearable).
• The GUI is being cleaned-up again (easier dialog controls).
• I'm re-writing the tutorial page (updated with next release).
• I've added a mesh file export.

Many more things to come. I don't know when the next release will be…Maybe in a month or two.