Admonitions call out places where the user should take special care.
Support added for HTML, PDF, Markdown and help text renderers. XML files have been updated accordingly.
Contributed by Cynthia Shang.
* Check both doc-path and bin-path for logo.
* Allow PDF to be output to a location other than the output directory.
* Use PDF-specific version variable for more flexible formatting.
1) Started on a general markdown renderer
2) Internal links now work in PDF
3) Improvements to PDF styling
4) Some comment and formatting fixes
5) User guide edits.
