- The capitalization is consistent with most other template classes, but
  more importantly frees up xfer() for use as method name without needing
  special treatment to avoid ambiguities.

  It seems reasonable to have different names for transfer(...) and xfer()
  methods, since the transfer is occuring in different directions.
  The xfer() method can thus replace the recently introduced zero-parameter
  transfer() methods.
  Other name candidates (eg, yield, release, etc.) were deemed too abstract.

- this should provide a slightly more naturally means to using transfer
  constructors, for example
          labelList list2(list1.transfer());
      vs. labelList list2(xferMove(list1));

- returns a plain list where appropriate (eg, DynamicList, SortableList)
  for example
          labelList list2(dynList1.transfer());
      vs. labelList list2(xferMoveTo<labelList>(dynList1));

 - 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

* DynamicList::allocSize(label)
  - Adjust the allocated size. The addressed list can be truncated but not
    extended, use setSize() for that.

* DynamicList::reserve(label)
  - Reserve allocation for *at least* this number of elements.
    Never shrinks the allocated size, nor touches the addressed list size.

* DynamicList::setSize(label)
  - proposed behaviour:
    Adjust the addressed list size, allocating extra space if required.
  - The current behaviour is ambiguous about what addressable size will
    actually get set and using it to extend the addressable size (as
    per List) automatically shrinks the allocated space to this size!

  - transfer(DynamicList&) now preserves the allocated space as-is
  - operator=(const List&) should now avoid spurious allocation/deallocation