Escape thermo comments for cantera to avoid xml problems with <> characters.
Escape thermo comments for cantera to avoid xml problems with <> characters.

We pass thermo group comments through to the cantera species objects, but some
of these comments may have < characters in, which screws up the xml of the
cantera file. The ctml_writer should escape this, but it doesn't, so we now
escape it in species.py before passing to cantera. (< becomes &lt;)

comocheng/RMG-Py,enochd/RMG-Py,chatelak/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,KEHANG/RMG-Py,comocheng/RMG-Py,pierrelb/RMG-Py,enochd/RMG-Py,faribas/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,nyee/RMG-Py,nickvandewiele/RMG-Py,KEHANG/RMG-Py,faribas/RMG-Py