Updated the acetyl + O2 example to use the new input file syntax.
Updated the acetyl + O2 example to use the new input file syntax.

The end result of this is a more flexible input format, as you can now
specify the collision model separately for each isomer and each
component of the bath gas.

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