Bugfixes after using on EBL system

- Fixed 'SetSvars', column now succesfully activates
- Function 'StepsizeDwelltime' fixed
- Function 'Load' fixed, now possible to load stepsize and beamcurrent
  from multisample.txt
- Increased advisedbeamspead to 8 mm/s
-

Known issues:
- Writefield change between samples may or may not work properly