Clean-up of hpl transformations and metaprogramming module.

[rbonifacio]

Much variation has been created in both layers, which I reckon is a result of two factors: a) Some idiosyncratic changes to Base.hs (see above) were too easily accepted as worth implementing. b) The existing and achievable generality of existing metaprogramming operators was not fully explored. For instance, addUpdateCase had been evolved for the bad, by actually removing its ability to include record update. Also, see addCase3 of HplAssets/Hephaestus/MetaProgramming.hs: it is a too specific operation tuned for a somewhat idiosyncratic situation. I guess this clean-up is not hard, for me anyway, once we have lowered the idiosyncrasies of the changes (see above).