Remove unused RMG().logFile attribute
Remove unused RMG().logFile attribute

Must have been originally intended for the logfile path,
but is not used at all, so it should be removed

pierrelb/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py