Added local wnom_ht parameters to flow-dependent heat transfer models for improved modularity

git-svn-id: https://thermopower.svn.sourceforge.net/svnroot/thermopower/trunk@295 80daafeb-7430-0410-91d5-8b30b0bbd841
Undid wrong change

git-svn-id: https://thermopower.svn.sourceforge.net/svnroot/thermopower/trunk@296 80daafeb-7430-0410-91d5-8b30b0bbd841