- Eg, with surface writers now in surfMesh, there are fewer libraries
  depending on conversion and sampling.

COMP: regularize linkage ordering and avoid some implicit linkage (#1238)

- avoids unnecessary cyclic dependency

- change internal naming from 'EXE_EXT' to 'EXT_EXE' for symmetry with
  'EXT_SO'

- continuation of commit 0e7954c2

ENH: downgrade abort() to exit() in some places (#1238)

Feature indirect lists

See merge request OpenFOAM-plus!253

See merge request OpenFOAM-plus!254

- now also track if the cellSet or cellZone has changed on point
  motion.

- also available as equal() member function

- make I/O operators global (non-member)

Patch contributed by Gavin Ridley.

- in case of cell overlapping a patch : set cell to hole always
- in case of cell changing from hole to calculated: set to hole
  and continue. Do so before 'flood filling' holes.
Patch supplied by Nicolas Edh.

- unnecessary. Can deduce labelRange from the pair of labels.
  These are all the same:

      list[labelRange(18,3)] = 100;
      list[labelRange{18,3}] = 100;
      list[{18,3}] = 100;

  Removing the run-time handling of std::initializer_list in favour of
  compile-time deduction allows the future use of sliceRange as well.
  Eg,

     list[sliceRange{18,3,2}] = 100;
     list[{18,3,2}] = 100;

- Enhancements provided by Y. Inoue at RIST (http://www.hpci-office.jp)
- Use allToAll to only swap local data (excludes master processor; saves memory)
- Memory saving is noticeable >= 4000 cores

This fixed the MeshObject on Time but produced problems for the
non-regIOobject MeshObjects.