All global reservoir cell indices for active cells can now be accessed from RigActiveCellInfo. This can make the extraction of data much easier and faster.
* Janitor: Improve getter for RigActiveCellInfo::gridActiveCellCounts.
* #9493 Grid Calculator: calculate on only active cells.
* #9493 Grid Calculator: filter with active cells.
* Fix calculation for input grid cases
Co-authored-by: Magne Sjaastad <magne.sjaastad@ceetronsolutions.com>