Fix metastable isotopes and Am-242 in cross_sections_nndc.xml.
Fix some metastables in cross_sections_serpent.xml.
Merge branch 'develop' into fix-nndc-xs
Check for proton, deuteron, triton, 3he, and alpha level cross sections with no
redundant total.
Expand list of reaction MTs that are checked.
Merge branch 'develop' into fix-nndc-xs
Update test results. Since the cross_sections.xml file was set up incorrectly,
Am-242m was actually pointing to Am-242. Many other nuclides affected by the
missing level cross section issue.
Fix 300 K data in cross_sections_nndc.xml and add missing metastable tags.
Remove 900 and 1200 K data from cross_sections_nndc.xml.
Merge pull request #305 from paulromano/fix-nndc-xs

Fix metastable nuclides listed for NNDC cross sections