Added Chris Herman's inputs for Mosteller benchmark.
Fixed spacing in geometry.xml for Mosteller benchmark.
Fixed fuel pin radius for 900K OpenMC cases in Mosteller benchmark.
Remove encoding on opening tag in settings.xml for Mosteller benchmark.
Fixed closing tags in materials.xml for Mosteller benchmark.
Modify water in OpenMC models for Mosteller benchmark.
Change all default_xs to 71c for Mosteller benchmark.
Remove trailing zeros on cladding density for Mosteller benchmark.
Change format of exponent for Mosteller benchmark.
Reformat UO2 materials in openMC models for Mosteller benchmark.
Reformat MOX materialx in OpenMC models for Mosteller benchmark.
Change exponent in MCNP models for Mosteller benchmark.
Change cladding to 600 K in MCNP models for Mosteller benchmark.
Change <criticality> to <eigenvalue> for Mosteller benchmark.
Changes run parameters for OpenMC models of Mosteller benchmark.
Change run parameters for MCNP models of Mosteller benchmark.
Change tmp card for cladding in MCNP models for Mosteller benchmark.
Change to point source in OpenMC models for Mosteller benchmark.