porousZone constructor in the same order as sampling

 - improves efficiency throughout

Absolute enthalpy h = hs + hc.

 - convertToMeters optional, also allow 'scale'

 - typedefs to simplify code
 - added scalePoints() member
   * this is especially useful for the triSurfaceMesh dictionary constructor
     when we have surfaces in mm or inches and don't wish to rescale in some
     external program

- drop copy components constructors in favour of the xfer versions. Even if
  the caller sends through constant data, if will be automatically promoted
  to xfer (via a copy operation).

  - dropped non-const tmp::clear() in favour of the const version

- use xfer form for calls to resetPrimitives

  - keyedSurface is similar to triSurface, but uses faces
  - meshedSurface is sorted in regions and should be more memory efficient
  - surfMesh is the placeholder name for an OpenFOAM native surface format