Add option 'eased' to NoiseParams

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Improved VoxelArea variable locality, thus performance

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Remove most exceptions from getNode() (and variants)
Fix warnings and other misc. minor changes
Mgv5 get ground level at point function