long and skinny SodShock example.

Former-commit-id: 04473e8738cce5cc98691f044b5ee63e3e452c40

examples/SodShock/makeIC.py

@@ -116,7 +116,7 @@ ds[()] = v
 ds = grp.create_dataset('Masses', (numPart,1), 'f')
 ds[()] = m
 ds = grp.create_dataset('SmoothingLength', (numPart,1), 'f')
-ds[()] = h
+ds[()] = h / 2
 ds = grp.create_dataset('InternalEnergy', (numPart,1), 'f')
 ds[()] = u
 ds = grp.create_dataset('ParticleIDs', (numPart,1), 'L')