Use the bounds set in the emission-line databases with Sasuke

[kbwestfall]

The parameter bounds, fixed values, and initial guesses are not used by Sasuke, but are hold overs from the Elric fitter. Confirm that statement is true, and then allow these to be used by the fitter by passing them to pPXF in xjmc.py.

[francbelf]

This is actually very important and we should aim to fix it for future MPL:)