[Equil] Fix infinite loop in VCS equilibrium solver

The threshold being removed here was introduced in r714, which was merged into
trunk in r1115.

Fixes Issue 113.

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@2525 02a645c2-efd0-11dd-984d-ab748d24aa7e
[Transport] Add electricalConductivity method to all language interfaces

Thanks to user 'hencken' for the patch.

Resolves Issue 171.

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@2526 02a645c2-efd0-11dd-984d-ab748d24aa7e