* Fixed and tested the changes necessary for org-mode to correctly
  parse pythonic (Python 3) indentation.
* Updated the source blocks to recommended upper case for BEGIN_SRC
  and END_SRC.
* Tested and confirmed XHTML output matches correct examples.
* Tested against pseudo-control output via exporting from org-mode to
  org-mode and then exporting that to XHTML.  Remaining differences
  appear to be discarding the custom tags used to provide X[HT]ML id
  elements to each section which does not appear to offer any benefit.
* Exporting directly to XHTML or other HTML output should no longer
  cause problems, but if there are any then the first step should be
  exporting from org-to-org and then exporting that to XHTML.