Iss9 mono move

[mdwyman]

In issue #9, the mono would get stuck in "Moving" state when attempting to set energy to current energy in auto mode (can easily happen when running experiments from Bluesky). The AO control PVs (Energy, Bragg, Lambda) will not cause any monitors to process but each PV will (via forward link) cause the mono's busy signal to be set to busy (aka "Moving"). The sequence program is responsible for "un-setting" the busy (aka Done) but since none of the AO control PVs cause a monitor to process, the sequence program doesn't leave it's waitForCMND state.

Two solutions were found:

• Setting MDEL of the AO controls PVs to -1 -- this will cause monitors to process even though PV value is unchanged (effectively turns off any deadband checks)
• Adding a monitor for the mono's busy PV to the sequence program along with a state for when the busy is changed. In this new state, if none of the control flags were set, it will still move to change states for the control PVs

The first solution doesn't require any changes in the underlying EPICS or sequence program support, so it can be used for older version of the optics module.

The second solution does requires the changes made in this branch.