Circumvented naming bug by generating random serials for linear solver.
Added `prune` method to GenericNetwork, allowing to remove pores based on mask
Two small changes to Template (doc and asarray)
Monochrome is a bad term (monochrome, maybe?)
Also added a tiny dubious `or 1` hack so that networks with exactly
zero dimension are calculated as having a span of 1 for asarray
calculations.