Minor bug fixes for new unstructured abilities
Initial multilayer test
Add more flexibility to regression test class
Merge branch 'unstructured-topography-additions' into add-multilayer-test
Further separate testing functionality

Also correct bug in topography type detection
Simplify further test specifications
Use `take` rather than `mask` in projection

Also fix some of the documentation
Merge branch 'add-multilayer-test' into multilayer-storm-surge
Add dry_tolerance to multilayer data

Also correct some spacing issues