Comments on PISMRoutingHydrology.  Moved hydraulic_potential() up to PISMRoutingHydrology.
Merge branch 'dev' into hydro-add-melt
shows where to put new wall melt calculation; does not compile
an initial implementation; not correct yet for distributed because then the wall melt should be a cavity opening term; even in routing, if you add the wall melt then the bwat field blows up, more-or-less as expected; power alpha mostly controls this; why the problem occurs at the edge of null strip in thinish ice is not clear to me
Merge branch 'dev' into hydro-add-melt
minor: add doc to ross example
Merge branch 'dev' into hydro-add-melt
Merge branch 'dev' into hydro-add-melt
Addressed #127: New option -hydrology_pressure_fraction replaces -plastic_pwfrac.  Scripts in examples/ have been updated, as has .tex docs, but other scripts pressumably need update.  Only option name and config parameter name has changed; there is no functional change.
improve quiver script display options
update script: -no_mass and -skip causes warning (fixed); bwat needed to interpret thermal stabilization in -no_mass run I think
Merge branch 'hydro-add-melt' into dev