- still needs fine-tuning (testing) to see if it reacts as anticipated under
  various conditions.

- previous draft version was HashTbl
- accidentally still had canonicalSize in templated code

Conflicts:
	src/OpenFOAM/matrices/simpleMatrix/simpleMatrix.C
	src/OpenFOAM/matrices/simpleMatrix/simpleMatrix.H
	tutorials/incompressible/simpleFoam/airFoil2D/Allclean
	tutorials/multiphase/settlingFoam/ras/tank3D/Allclean

- don't let automatic resize into integer overflow
- avoid possible overflow in increment()

StaticHashTable - fix erase()/++ as per HashTbl

- might still be worth dropping it, but at least it'll be in better
  condition when it gets chucked!

- the end iterators and canonicalSize are independent of the templated
  parameters, so move them to HashTblCore

- this avoid allocating separate end iterator at all.

  end(), cend() return a iteratorEnd.
  iterator == iteratorEnd just checks for non-NULL pointer on iterator.
  The compiler should optimize most of it away.

- fix off by one error in erase/increment code

- iterators store pointers instead of references to the HashTbl.
  This lets us use the default bitwise copy/assignment

- add empty constructor for iterators. It returns the equivalent to end().
  This lets us do this:
      HashTbl<label>::iterator iter;
      // some time later
      iter = find(Value);

- erase(const HashTbl<AnyType, Key, AnyHash>&) is now more generous.
  Only the Key type matters, not the hashing function.

- for the hashTableTest3, it seemed to slow things down a bit

loop 0 - Erased 100000 elements (size 2900000 capacity 4194304) 0.31 s
loop 1 - Erased 100000 elements (size 2800000 capacity 4194304) 0.01 s
loop 2 - Erased 100000 elements (size 2700000 capacity 4194304) 0 s
loop 3 - Erased 100000 elements (size 2600000 capacity 4194304) 0 s
loop 4 - Erased 100000 elements (size 2500000 capacity 4194304) 0.01 s
loop 5 - Erased 100000 elements (size 2400000 capacity 4194304) 0 s
loop 6 - Erased 100000 elements (size 2300000 capacity 4194304) 0 s
loop 7 - Erased 100000 elements (size 2200000 capacity 4194304) 0 s
loop 8 - Erased 100000 elements (size 2100000 capacity 4194304) 0.01 s
loop 9 - Erased 100000 elements (size 2000000 capacity 4194304) 0.44 s
loop 10 - Erased 100000 elements (size 1900000 capacity 4194304) 0.44 s
loop 11 - Erased 100000 elements (size 1800000 capacity 4194304) 0.39 s
loop 12 - Erased 100000 elements (size 1700000 capacity 4194304) 0.4 s
loop 13 - Erased 100000 elements (size 1600000 capacity 2097152) 0.15 s
loop 14 - Erased 100000 elements (size 1500000 capacity 2097152) 0.01 s
loop 15 - Erased 100000 elements (size 1400000 capacity 2097152) 0 s
loop 16 - Erased 100000 elements (size 1300000 capacity 2097152) 0 s
loop 17 - Erased 100000 elements (size 1200000 capacity 2097152) 0.01 s
loop 18 - Erased 100000 elements (size 1100000 capacity 2097152) 0 s
loop 19 - Erased 100000 elements (size 1000000 capacity 2097152) 0.27 s
loop 20 - Erased 100000 elements (size 900000 capacity 2097152) 0.2 s
loop 21 - Erased 100000 elements (size 800000 capacity 1048576) 0.1 s
loop 22 - Erased 100000 elements (size 700000 capacity 1048576) 0 s
loop 23 - Erased 100000 elements (size 600000 capacity 1048576) 0 s
loop 24 - Erased 100000 elements (size 500000 capacity 1048576) 0.12 s
loop 25 - Erased 100000 elements (size 400000 capacity 524288) 0.04 s
loop 26 - Erased 100000 elements (size 300000 capacity 524288) 0.01 s
loop 27 - Erased 100000 elements (size 200000 capacity 262144) 0.02 s
loop 28 - Erased 100000 elements (size 100000 capacity 131072) 0.02 s
loop 29 - Erased 100000 elements (size 0 capacity 2) 0 s

- The ideas as discussed in email

- The speedup is really there.

Before
loop 0 - Erased 100000 elements:   3.82 s
loop 1 - Erased 100000 elements:   11.45 s
loop 2 - Erased 100000 elements:   19.46 s
loop 3 - Erased 100000 elements:   27.73 s
loop 4 - Erased 100000 elements:   38.74 s
^C

After
loop 0 - Erased 100000 elements (size 2900000 capacity 8388608) 0.01 s
loop 1 - Erased 100000 elements (size 2800000 capacity 8388608) 0 s
loop 2 - Erased 100000 elements (size 2700000 capacity 8388608) 0.01 s
loop 3 - Erased 100000 elements (size 2600000 capacity 8388608) 0 s
loop 4 - Erased 100000 elements (size 2500000 capacity 8388608) 0 s
loop 5 - Erased 100000 elements (size 2400000 capacity 8388608) 0 s
loop 6 - Erased 100000 elements (size 2300000 capacity 8388608) 0 s
loop 7 - Erased 100000 elements (size 2200000 capacity 8388608) 0 s
...

- rename to HashTable later when it is considered stable

Now 0.org.