- If the underlying type is contiguous, FixedList hashes its storage directly.
- Drop labelPairHash (non-commutative) from fvMeshDistribute since
  FixedList::Hash does the right thing anyhow.
- Hash<edge> specialization is commutative, without multiplication.
- Hash<triFace> specialization kept multiplication (but now uLabel).
  There's not much point optimizing it, since it's not used much anyhow.

Misc. changes

- added StaticAssert to NamedEnum.H
- label.H / uLabel.H : define FOAM_LABEL_MAX, FOAM_ULABEL_MAX with the
  values finally used for the storage.  These can be useful for pre-processor
  checks elsewhere (although I stopped needing them in the meantime).

- not much speed difference between SuperFastHash and Jenkin's lookup3 but
  both are 5-10% faster than what is currently implemented in Foam::string,
  albeit inlining probably helps there.

- TODO: integration with existing infrastructure

http://openfoam.cfd-online.com/cgi-bin/forum/show.cgi?126/10948

- catch people using silly template sizes for FixedList, PackedList

- compare iteratorBase == iteratorBase by value, not position
  thus this works
      list[a] == list[b] ...

- compare iterator == iteratorBase and const_iterator == iteratorBase
  by position, not value. The inheritance rules means that this works:
      iter == list.end() ...
  this will compare positions:
      iter == list[5];
  Of course, this will still compare values:
      *iter == list[5];

- Hash returns unsigned
- FixedList templated on unsigned int
- include uLabel.H in UList, HashTable etc. so the output function is know
  throughout

- make table power-of-two, but since it seems to give 1-2% performance
  improvement, maybe forget it too.

- remove two-argument form of hashing classes and do the modulus direclty
  within HashTable instead. This simplifies things a fair bit.

- migrate Hash<void*> from db/dlLibrary to primitives/hashes/Hash

- it was possible to create a PackedList::iterator from a
  PackedList::const_iterator and violate const-ness

- added HashTable::printInfo for emitting some information

- changed default table sizes from 100 -> 128 in preparation for future
  2^n table sizes

- much better performance on empty tables (4-6x speedup), neutral
  performance change on filled tables. Since tableSize_ is non-zero when
  nElmts_ is, there is no modulus zero problem.

http://openfoam.cfd-online.com/cgi-bin/forum/show.cgi?126/11287

- this allows SubField<point> for unallocated storage in PrimitivePatch