GALILs: Provide an easy tool to restore motor positions

As a support person I would like to easily be able to restore motor positions on power out. Currently this is a manual job and requires looking in the archive engine to find old values. There should be some sort of warning to the user when doing this to make sure the axis hasn't moved whilst power has been down.

### Acceptance Criteria

- ~I can run a script which will set the positions of motors~ (Done)
- ~the positions are got from archive/autosave (pick best)~ (Done)
- ~the time I pick is specified in the script~ (Done)
- I can run a script which tells me the time when controller last had a value that was not zero and the status of DMOV at the time so that I can set the previous script to be before that time
- Script warns of caveats of restoring previous positions:
- might have been moved by scientist
- ups might have failed before move finished
- computer may have died before end of move