Improve error handling when calling ck2cti and ctml_writer
Improve error handling when calling ck2cti and ctml_writer

Only look for modules in the new location (inside the cantera package), and
print the path if they aren't found, to aid in debugging.

git-svn-id: e76dbe14710aecee1ad27675521492cea2578c83@2667 02a645c2-efd0-11dd-984d-ab748d24aa7e

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