- if mandatory is true, findEtcFile() will abort with a message (via cerr).
  This allows a non-existent file to be caught at the lowest level and avoid
  error handling in IFstream, which might not be initialized at that stage.

- moved findStrings from stringList to new stringListOps
  (helps reduce the influence on dependencies)
- findStrings can also do partial matches

 - using SizeInc to define the granularity in the SizeMult=0 needed?

- setSize() adjusts the addressable length only.
  Changed setSize(label) usage to setCapacity(label) or reserve(label)
  throughout. The final name (capacity vs. storageSize() vs. whatever) can
  easily be decided at a later date.
- added setSize(label, const T&), which may still not be really useful, but
  is at least now meaningful
- made shrink() a bit more legible.
- added append(UList<T>&)
- copying from a UList avoids reallocations where possible

The following bits of code continue to use the DynamicList::setSize(), but
appear to be legitimate (or the corresponding code itself needs rethinking).

  src/OpenFOAM/meshes/primitiveMesh/primitiveMeshPointCells.C:167: error: within this context
  src/OpenFOAM/lnInclude/faceTemplates.C:44: error: within this context
  src/surfMesh/surfaceFormats/tri/TRIsurfaceFormatCore.C:178: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:737: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:741: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:745: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:749: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:754: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:935: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:940: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:1041: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:1046: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2161: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2162: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2201: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2205: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2261: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2262: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2263: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2264: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:2265: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:3011: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:3076: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:3244: error: within this context
  src/dynamicMesh/polyTopoChange/polyTopoChange/polyTopoChange.C:3371: error: within this context
  src/dynamicMesh/meshCut/cellLooper/topoCellLooper.C:73: error: within this context
  src/dynamicMesh/meshCut/cellLooper/topoCellLooper.C:91: error: within this context
  src/dynamicMesh/meshCut/cellLooper/topoCellLooper.C:73: error: within this context
  src/dynamicMesh/meshCut/cellLooper/topoCellLooper.C:91: error: within this context

- plain nTriangles() inline method for face class
  - triFace gets the same for symmetry
  - face::triangles(), face::trianglesQuads() return the number of faces generated
  - face::triangles() can append to a DynamicList

- boundBox::invertedBox is useful for initializing our own calculations
- NOTE treeBoundBox::greatBox is still in place, since it uses GREAT
  instead of VGREAT. If this is only historical, we can drop it.

 - operator+=  : add in the listed keys
 - operator-=  : remove the listed keys
 - operator&=  : intersection of keys
 - added xfer constructor (just in case)
 - moved labelHashSet typedef to HashSet.H, for consistency with the
   wordHashSet typedef being there and since it is used so often

- 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).

- use xfer form for calls to resetPrimitives