Closes: #1307
This serves as a path way for production in I129 without
impacting transport because
1) Te129 has no ground state cross section data, due to
2) Te129 decays to I129 with a half life of about an hour
Running scripts/openmc-make-depletion-chain-casl now has the
following changes:
1) Te129 is present
2) Te129_m1 decays to Te129 with branching ratio of 2/3 using
ENDFB 7.1 data [pulled using tools/ci/download-xs.sh]