- actually blend correction factors as well in fixedBlended scheme

- consistency change: move 'linearUpwindV' into same directory as
  'linearUpwind', move correction code from .H into .C code.

- minor docu format/spelling changes

A more general question:
~~~~~~~~~~~~~~~~~~~~~~~~
- would it make more sense to use template specializations for the
  '*V' differencing schemes?

- fixed misc. copyright dates, other cosmetics

    - incompressible, Boussinesq variant of buoyantSimpleFoam
    - requires new fixedFluxBoussinesqBuoyantPressure bc on pd at walls
      to balance the flux generated by the temperature gradient

Changed the quadratic scheme to quadraticLinear (linear in the plane of the face).
Added a linear scheme based on the CFC stencil used by the quadratic scheme.

Added the quadraticFit interpolation scheme.

This reverts commit 248b15e7.

Added new BC (untested).

Sorted the boundary condition list to ease tracking in the future.