ENH: improve OpenFOAM I/O for std::vector container

- input: added support (similar to DynamicList)
- output: redirect through UList output, which enables binary etc

- these changes enable support for broadcast and other parallel IO
  for std::vector

ENH: support SubList of std::vector (entire length)

- allows a 'glue' layer for re-casting std::vector to UList etc