Set the pt and chi2min limits for the tau and bjet tracking instances

The ptmin for the bjet instance was previously set, this request also adds the limit for the tau instances. It also sets the chi2min for the tauIso and bjet tracking to 12 and can be over ridden by a preexec.

In addition it adds the Roi z width to the tracking configuration, and takes the settings used for the slice from the configuration rather than using the default parameters - the settings from the slice config currently have the same values as the default so the current settings of the Roi widths should not change.

The changes to the pt for the tau reconstruction, and the chi2 for the tau and bjet will likely lead to count changes. The references will be updated once the tests have completed.