Starting configuration settings for Doxygen

Doxygen needs to be configured and appropriate comments that work with Git's
internal functionality need to be tested to ensure the output documentation is
adequately formatted.

File: Doxyfile
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- Added section-label DATE_CREATED to the ENABLED_SECTIONS tag

File: GramSchmidt_App/src/GramSchmidt.cc
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- Deleled the test $Format:...$ string

File: Utilities/libutlmath/src/Vector.cc
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- Added the $Format:%an$ and $Format:%cd$ for author name and commit date,
  respectively, when an archive is generated. This way, when a release tarball
  is made, these fields will have been expanded to the correct author name and
  commit date.
- A @ifnot...@endif conditional was added to the Doxygen comment block to
  exclude the "Date Created" line from the generated documentation. It is kept
  in the file for user reference.