-> Added a pureFluidTest problem that only gets carried out if
the WIT_PURE_FLUIDS conditional compile takes place.
-> added more to testWaterTP, so that it queries the unstable
water region up to the spinodal curve.
Added info to DebyeHuckel. It's getting to be near a documented state.
test suite fix:
fixed Makefile.in's. The .depends were not being included in the Makefiles.
It should now be more stable.