surface bugfixes

src/org/opensha/calc/AsyncCalc.java

src/org/opensha/calc/CalcTest.java

src/org/opensha/calc/HazardResult.java

src/org/opensha/calc/Transforms.java

src/org/opensha/calc/Utils.java

...g/opensha/eq/fault/surface/GriddedSurfaceWithSubsets.java

src/org/opensha/eq/model/HazardModel.java

src/org/opensha/eq/model/Loader.java

src/org/opensha/gmm/Imt.java