[ck2cti] Permit lower case keywords in Chemkin input files
[ck2cti] Permit lower case keywords in Chemkin input files

Although the specification of the file format doesn't appear to allow lower
case keywords, many mechanisms are distributed using them.


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