Update Doxygen to 1.8.6 and New Repo Location

This change set does not include any source file updates.  Important changes include:

Updates the .gitignore file to ignore the documentation build directory. (Docs/html)

Documentation configuration files are updated to Doxygen 1.8.6.  This provides some improvement to documentation layout but the big improvement is that it fixes odd behavior in Chrome.

The only content changes in this change set are to the home page, which is sync'd with the GitHub home page, and links that were pointing to the old SVN repository.

The documentation output can be reviewed at: http://www.stevefsp.org/projects/rcndoc/prod/