Re #7989. Made loading the events optional.

Also redid the entire first tab's layout and added the Qmin option.
Re #7989. Improving layout a bit more.
Re #7989. Finally got the scrollpane working.
Re #7989. Fixed up the layout of the Find Peaks tab.
Re #7989. Fixed up the layout of the Find UB tab.
Re #7989. Fixed up the layout of the Choose Cell tab.
Re #7989. Fixed up the layout of the Change HKL tab.
Re #7989. Fixed up the layout of the Integrate tab.
Merge remote branch 'origin/feature/7989_scd_dont_reload_data'