Updated isotopic abundances to IUPAC 2009 data
fixed some doc errors
resized endf thumb
Merge branch 'cbrachem-staging' into staging
updated makefile
Fix error in Ni-58 natural abundance.
Use natural abundances from abundances.txt for nuc_data.h5
updated tests for new abundances
fixed comment text
Include 2012 atomic mass evaluation data rather than downloading.
some header file changes
nucname::id(int)
updated nucname
first hack at refactor
updated element symbols
updated cython bindings
nucname tests pass
zzaam changed everywhere...segfaulting
UNTESTED: wrote znum(), anum() and snum()
Added znum(), anum(), snum() tests