Example calculation of enhancement factor for pism/pism#301

running `runEnhancementFactor.sh PATH -3.0 0.0 -1710400`, where `PATH`
is the path to the `enhancementFactor` execuable from FEvoR, will
recreate what should have been output from example provided in
pism/pism@db1029d55004834cc8a53bd06d4f3e5b835f1186

Should have the same input vaiables to `d1.stepInTime(...)` as in
PISM-FEvoR run.