Add Lincoln high yield wheat experiments to test set

[HamishBrownPFR]

working on #8820

[par456]

Just noticed that the data in the GrainSize column that you renamed was also in the wrong units. PO stats shows it across a few of the tables.

[HamishBrownPFR]

resolves #8820. @hol353 @par456 @ric394 please review and merge if happy. I have added two test sets to the wheat validation, removed superfluous columns from the observed files (i.e things that can't be compared with model outputs) and fixed a variable name (Wheat.Grain.GrainSize -> Wheat.Grain.Size.
Most changes to the stats are positive or trival negatives. The negative changes that are not trival are due to the inclusion of the Wheat.Grain.Size data in PO stats and in LAI where the then data sets added are highlighting some challenges to the model. These issues are being worked on in a current project

[hol353]

@HamishBrownPFR This looks ok but can you get this branch up to date please to be sure.

[HamishBrownPFR]

@hol353 sorry, I thought it was up to date. should be now.

[hut104]

@HamishBrownPFR Do you know why the total number of Haun stage data in ObsDaily stats has decreased?
I understand the values of N increasing for other outputs, but not a decrease?

[HamishBrownPFR]

@hut104 good question. It should have gone up. I will investigate

[HamishBrownPFR]

@hol353 @hut104 The SimulationName column in LaTrobeCE_OBS had an equation in some rows that was referencing some of the superfluous columns I deleted. I have instated the correct simulation names without equations.

[HamishBrownPFR]

@hol353 this should be good to merge now