Add option to resume *this* acquisition (or similar)

[raacampbell]

It's possible to make the mistake of resuming a different acquisition. Usually this is a finished acquisition so the sample block can get destroyed by the objective or the blade.

Solutions are:

• Resume should open in the current sample folder.
• A resume this acquisition option that will load by itself the last available recipe file from present acquisition. This can be available only when an acquisition has already started. After sample -> new or a new start this option should be missing from the menu.

Remember that we may have had a crash and want to resume the acquisition after a fresh start. These options won't help that. But maybe we can have a cache file that contains the name of the last acquisition so we could have a menu option to resume the last acquisition?