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.

git-svn-id: e76dbe14710aecee1ad27675521492cea2578c83@1456 02a645c2-efd0-11dd-984d-ab748d24aa7e

Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn