[Thermo] Use findXMLPhase in initThermoFile
[Thermo] Use findXMLPhase in initThermoFile

This allows many constructors which take a filename to work with CTI files
directly, and to make use of the parsed XML cache.

git-svn-id: e76dbe14710aecee1ad27675521492cea2578c83@3185 02a645c2-efd0-11dd-984d-ab748d24aa7e

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