WIP: Connecting the GUI 4

Toward issue #133!

This commit enables the fancy "select offset" dialogue.
Reimplemented ExperimentSettings

I don't really know what that previous stuff was, but I didn't understand
how to fully implement it, and we need some settings, so I thought I'd
do something.
WIP: Connecting the GUI 4

Toward issue #133!

Starting to plug in the Analyzer.