ctml_writer accepts 'id' argument as lower case
ctml_writer accepts 'id' argument as lower case

This maintains compatibility with existing (<=1.8) input files, at the
cost of being poor Python style since it overloads the built-in 'id'
function.


imitrichev/cantera,imitrichev/cantera,imitrichev/cantera,Heathckliff/cantera,imitrichev/cantera,imitrichev/cantera,Heathckliff/cantera,Heathckliff/cantera,imitrichev/cantera,Heathckliff/cantera,Heathckliff/cantera,Heathckliff/cantera