Discard placeholder README.md files.
Add missing doxygen blocks.
Improve documentation

  - add a link from README.md to the Doxygen output for "inc"

  - adjust inc/Doxyfile to:
    - Fix project anme
    - Turn on JavaDoc Autobrief
    - set tab expansion to 8 spaces
    - reduce amount of log output
    - enable more warnings
    - turn on source browser
    - add more meaningless Dot graphs
    - turn on the tree-view as a left-panel in the HTML
    - enable the use of MathJax (in SVG mode)
    - tune the LaTeX otuput
    - enable "man" output to section 3

  - add more missing doxygen clauses

  - add inc/MAINPAGE.md which will be the landing page for
    the Doxygen documentation for the "inc" directory.

  - assure that "make undox" removes "man" trees made by Doxygen.

  - rename Position to ThreeVec and document the reason for
    it to exist (because Cross Product is only for three-component
    vectors within this project)

  - move ThreeVec implementation to matrix.cc for now (it can be
    returned to matrix.h if performance becomes an issue). I want
    to at least have *something* in the implementation file!
Test::pass() available, consumes supporting text.

I am getting a bit fed up with supporting text from passing
conditions being included as supporting text in subsequent
failing conditions.

Testing code can now call t.pass() to indicate that previously
sent supporting text is associated with this named test condition,
and should not be presented with subsequent conditions.

It is still perfectly fine to run several cases in a row ending
with a failing case, without a t.pass(), if you still want all
of the supporting text for the series to be presented as supporting
text for the failing case ...

In addition, accumulated supporting text will not be dumped into
the body of the XML <test> object when it is closed, as this does
not translate into any useful display.
Vector Cross Product

Also:
  Separate increment and decrement opeartions
  from their association with operators.

  negate operation does its work in-place now.

  Log, Suite and Test remember their names.

  Test provides conditional printing of test results

  untabify and reindent sources