Allow access to nodes and elements
Improve reading of ASCII DAT files (also fixes #67)
Better support for SMS ASCII DAT format
Fix loading of projects with ASCII datasets
Added export of raw (unstyled) Crayfish data to grid (GeoTIFF)
Imported support for upload to illuvis
Export raster grids from within GUI (layer context menu / plugin menu)
Uploading of current Crayfish layer to illuvis