Added a new estimate for the R_Add_Multiple bond Ca_Cds-HH + CdsJ=Cdd
Small modification to extend RMG-Java to Cl.
- Added some basic thermo (far too insufficient to generate full Cl networks)
- Minor code change for naming of species with Cl
More helpful message for Pdep failure

My jobs suddenly started failing while running pdep jobs,
this was because one of the libraries I was using had
irreversible reaction. This commit will give a more helpful
message when it fails.

Irreversible exit channel is typically allowed in pdep codes
like variflex, I am not sure if we should just check for
whether reaction is irreversible and only then try to reverse it.
Or make an irreversible reaction also reversible in order to
maintain thermodynamic consistency (?).
Better estimates for the HBI for OO-H bonds taken from The comprehensive handbook of bond dissociation energies, Yu-Ran Luo 2007
Merge branch 'master' of https://github.com/GreenGroup/RMG-Java