GEOS-Chem update: Merge PRs 1796, 1987, 1990, 201{1,3}, 2039, 204{0,2,3}

This commit informs the GCHP superproject about the following
commits that were pushed to the geoschem/geos-chem repository:

78c1b7dc3 Merge PR #2042 (Fix HEMCO_Config.rc for CH4 and carbon simulations)
54e8cdafc Merge PR #2043 (Fix typos written to GCHP int test log files)
382f11dca Merge PR #2040 (Lower GCHP timestep threshold if > C180)
ed1a20ec6 Merge PR #2039 (Improve missing CH4 emissions error message)
1b47584ba Merge PR #1990 (Add --no-bootstrap option to integration tests )
48a244826 Merge PR #2013 (Fix incorrect comment on static H2O option)
533128246 Merge PR #1796 (Use integer flags to denote species units)
3388e7fed Merge PR #1987 (Prevent POAEMISS from being assigned if not allocated)
1b05bfdf8 Bug fix: Remove duplicate species flags in fullchem_mod.F90
b2e7f7056 Merge branch 'release/14.1.2' into dev/no-diff-to-benchmark
f5f84fba9 Merge PR #2011 (Fix titles for 14.2.0 and 14.2.2 in CHANGELOG.md)

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>