More work on description of v2.0 changes.
Moved .cfg files in share folder to settings directory.

Also updated solver settings as necessary.
Updated information.

Improved discussion of scales in nondimensionalization.
Updated solver settings.
Improved time stepping discussion.
Improved output discussion.
Small fixes for v2.0.

Changed CellFilterAvgMesh to CellFilterAvg.
Small edits to wording.