added res scat variables to template files
added type for 0K nuclides
added 0K xs global variables
modified template files to allow for multiple scatterers
added logical indicating resonant nuclides
first crack at weight correction method (WCM) target sampling
allow for diff E ranges and methods for each scatterer
added resonance scattering header
cleaned up variables to switch to the ones defined in res_scat_header
added required dependencies
function for calculating 0K xs
moved contents of res_scat_header to ace_header
started setting up reading in 0K xs
incorporated ResScatterer derived type into Nuclide
removed separate 0K subroutines
removed extraneous res scatter variables
removed dependence on ResScatterer type
wcm w/ arbitrary number of nuclides tentatively working
DBRC tentatively working
fixed calculation of 0K xs