gui units: provide a short version of the readable time
acq find overlay: indicate dwell time in metadata

allows a "user" to know what turned out to be a good dwell time.

also update the future's progress (mostly for demo)
gui popup: change timeout arugment to take time in s

it's better to follow the convention to always express time in s, instead of ms.
Also make the default time more explicit.
model VA: clean up
gui fine align: small improvements

Add cancel button
Indicate estimated time before hand
Disable toolbar while doing the fine alignment
Remove "successful" text if the lens is moved