comment out fine-grid runs
Made test script more flexible.
Make omega=100, i.e. Wtil will tend to be 100 times if W is small, though Wtil is bounded and W is not and W+Wtil is conserved.
Found and fixed serious bug in PISMRoutingHydrology::conductivity_staggered() which invalidates a lot of recent results.  Made update of Wtil match notes.  Made update of W match notes.  Update of Wtil occurs before that of W (also matching notes).  Removed unnecessary reporting in PISMRoutingHydrology::boundary_mass_changes(), and applied that routine to both W and Wtil.