setting up test against Kelly Richardson's container experiment
updated onelumpevapconddrying to have correct kTc and j formulae for conduction
found bug in OneLump_raster script for free convection - first scenario wasn't added into the final result, and the last scenario spanned the second last and so those cases where Ra was in this range had double the value for Nu!

Also included Warren's derivation for the model including evaporation and conduction - that derivation still needs the formulae to be finalized for the different shapes (mostly there but not quite)