Added offset and related setters and getters AM1DProcessVariableDataSource. Used in SXRMB Bruker to offset the axis to -18eV. Also set the eV per bin to 5. Tested on the Bruker screen and EXAFS scan and appears to work.
Merge branch 'Issue930' of github.com:acquaman/acquaman into Issue930
Added:
First version of beam on and beam off actions to SXRMBBeamline.

Added:
Buttons and logic to SXRMBPersistentView for beam on and beam off.

This has not been tested. It needs basic testing and discussion with beamline staff to determine the correct behaviors.
Merge branch 'Issue930' of github.com:acquaman/acquaman into Issue930