this program uses the isotope mass data from ENDFVII contained in the IsotopeMass class file by default
make sure that the material consistently use wt% or abundance to define their composition otherwise errors may occur in the output
X create a static container class that contains the isotope mass used by the MCNP input file using another program
add ability for this code to determine the ENDF version that is being used by the isotope and have it run the previously mentioned program and create a temporary
static container with the isotope mass list for that version of ENDF and use it
Extract MCNP Material Composition from ENDFVII