Merge with fixed version on EBL pc.

- Fixed loading of Multisample.txt
- Fixed calling function for beamcurrent and stepsizes (replacing === with
  ==)
- Fixed function for beamcurrent and stepsizes by GUIflag variable.:

Known issues:
- Using beamcurrent and stepsizes from Multisamples.txt does not work.
  User is asked to perform beamcurrent measurement every time.
- User is always prompted for manually setting stepsizes, automatic
  calculation does not work.
- Not enough cancel buttons!