- code reduction, documentation, code stubs for spheroid (#1901)
- make searchableSurfaceCollection available as 'collection'
for consistency with other objects
- use simpler decomposeParDict in tutorials, several had old
'boilerplate' decomposeParDict
- use simpler libs () format
- update surface sampling to use dictionary format
The final leak can only be decided once all cells have been
deleted. So only exit on final invocation and give warning-only
beforehand. This avoids a lot of false positives.
The tutorial itself didn't actually produce a mesh with leakage
with the old settings. Upped the refinement level to force it
to go through the hole in the geometry.
