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ENH: inherit DynList from UList and use FixedList/List for internal storage

See merge request !3

- improves alignment of DynList with other OpenFOAM list containers
  (especially DynamicList), increases code reuse, simplifies memory
  management.

- avoids needless creation of a regExg and comparison when the content
  is a plain string anyhow

- more consistent with other OpenFOAM containers.
  With the exception of meshSubset, the other classes already had the
  found() and find() methods added previously.

- consistent with the static sizing of FixedList,
  but signed for convenience

* The generic templated constructor and assignment
  Eg,
     template<class ListType> DynList(const ListType& lst)

  Provides the best candidate when there is a int32/int64 mismatch:
     DynList<int64_t> list(10)

  The cleanest solution would be avoid the generic templated versions
  entirely, but they are needed when converting from rows of graph data
  (which are stored as LongList). However, this approach introduced some
  odd regressions.

- erroneous conversion from LongList to DynList

Namespace and tutorial adjustments

See merge request !2

Integration update methods

See merge request !1

The tutorials cartesianMesh/bunnyOctree, cartesianMesh/sBendOctree
do not run through very smoothly, so tagged as 'Optional' for now

- avoids potential collisions and allows easier migration of classes
  into OpenFOAM itself

- use fully-qualified names in implementation

- the previous code used a dual-purposed graphRow for non-const/const
  access. However, clang 4.0 rightly identifies there being no
  constructor path from "graphRow<T>" to a "graphRow<const T>".

  Since the row-access is a somewhat similar concept to an STL-iterator,
  now provide non-const and const versions of the row access.

- use range-for when iterating over HashSet

- prefer forAllIters(), forAllConstIters() with automatic decltype

    containsAtPosition   -> find
    contains             -> found

    lastElement          -> last
    removeLastElement    -> remove()
    removeElement(int)   -> [TODO]  remove(int, bool)

    fcElement -> fcValue
    rcElement -> rcValue

- Eg, readIfPresent() instead of found() followed by lookup()

- use FUNCTION_NAME for IO checks