Tidy up UQ ADF
It looks like there is quite a bit of redundancy in the functions offered for UQ. In particular I don't think the UQMeasurementset is currently very useful. Either we should extend it and offer it for all algorithms, or get rid of it and always use separate vectors of parameters/positions and solutions (or a std::pair thereof).
However since I am not the one currently using these algorithm (and don't know what all the new functions do) I don't want to change it more than I already did. @trunschk can you have a look at it?