- reduces unexpected interactions between various make elements

- The dirToString -strip option is simple, but reduces effort for the caller.

- also add some comments about the side-effects

- For convenience, let "wmake some/path/filename.C"
  behave similar to    "wmake some/path"
  and trace back for the Make directory.

Flat list output

See merge request !93

For certain combinations of rays and triangles the fast bb-triangle intersection
routine is not correct. For now revert to slow edge-by-edge intersection.

BUG: noise - updated creation of control dictionary to allow -case option and env variables.  Fixes #402

- Introduce writeList(Ostream&, label) method in various List classes to
  provide more flexibility and avoid hard-coded limits when deciding if a
  list is too long and should be broken up into multiple lines (ASCII only).

- The old hard-code limit (10) is retained in the operator<< versions

- This functionality is wrapped in the FlatOutput output adapter class
  and directly accessible via the 'flatOutput()' function.

Eg,
    #include "ListOps.H"
    Info<< "methods: " << flatOutput(myLongList) << endl;

    // OR

    Info<< "methods: ";
    myLongList.writeList(os) << endl;

- templated code that is not actually be used yet.

ENH: avoid combineFields for serial case

Note: a 'master-only' variant with combineList only on the master and
without scatter can be pursued later.

- either (or both) of 0/, 0.orig/ may exist, so error messages about
  one of them being missing is a bit misleading

- collects the log information only, without running any cases.
  This can be useful if the user has terminated the test prematurely
  but nonetheless wishes to summarize the log output.

- constness on local variables, pre-increment on loops, parameter names

- outputs compound tags etc.
  Should only be called by itself or by a derived class.

- fast means of ensuring we are only testing what is contained in the
  repository

- Constructs a validated word, in which all invalid characters have
  been stripped out and any leading digit is '_'-prefixed.
  Words with leading digits cause parse issues when read back later.

- Replaces previous functionally identical code from src/conversion

--
COMP: test against nullObject instead of checking address for null pointer.

Feature bbox improvements

See merge request !92

- regression introduced by a7195288

STYLE: add meaningful solid names for some stl files

- more stable/predictable to check for a bounding box !empty() rather
  than comparing to greatBox directly.

- The code create a box with a (0,0,0) point.
  The new definition is more logical and makes it very easy to grow
  the bounding box to include new points. It also simplifies much of
  the logic in the constructors.

- Use ROOTVGREAT instead of VGREAT for sizing greatBox and invertedBox.
  Avoids some overflow issues reported by Mattijs (thus GREAT has been
  used in treeBoundBox), but might still need further revision.

- to the referenced object via a method name, which may be clearer
  than deferencing the iterator

     [key, value] =>  iter.key(), *iter
     [key, value] =>  iter.key(), iter()
     [key, value] =>  iter.key(), iter.object()

- print and copy operations should not be allowed to dereference a
  nullptr.