Add Ability to Set Ops Parameters During Web Config

[Xylopyrographer]

When configuring a STAC with a web browser, add the ability to also set the active tally channel, operating mode and display brightness via the web form.

How to check that the active channel is <= max tally channel before submitting the form?

[mqshaw]

Referencing a comments that I have added in the discussion forum ... modification of STAC configuration using an EWS.

Discussion thread : #2