Added the ability to take a scan parameter (xval) with each circuit a…

[dcmckayibm]

Add qubit polarization to results and xval to circuit

Description

1. Added an xval to the qobj for each circuit for a parameter that can be tracked (e.g. the wait time in a T1)
2. Added a qubit polarization output to the results which spits out an array giving the qubit polarizations for each circuit.

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[ewinston]

I think a better place for the xval parameter would be in the qobj['circuits'][circuit_index]['config']['xval']=xval or perhaps qobj['config']['xval']=xval_list since it doesn't seem like it's strictly necessary to define a QuantumCircuit.

[dcmckayibm]

@ewinston I changed it back so that xvals is a dictionary passed to the results function. The only change beyond _results.py is that I updated so that the qobj in compile copies the config that gets passed in.