Add diagram of interprocess data and communication

Based on an old aquilon related diagram provided by @njwilliams.
Update process diagram and add svg source
Document Quattor 13.9.
Announce the GH repo with the templates.
Merge pull request #39 from piojo/release-notes-13.9

Release notes for 13.9
Improve the release notes
Merge pull request #40 from piojo/release-notes-13.9

Improve the release notes
Update the documentation for the Aquilon dependencies
Start documenting for real Aquilon deployments
Update the documentation of Aquilon dependencies.
Document how to get a Quattor instance started
Merge pull request #41 from jrha/master

Add link to release tags in config-modules-core-templates
Improve the documentation of Aquilon installs
Update 2012-06-19-documentation-overview.md

Add interprocess flow diagram to overview.
Merge pull request #42 from piojo/aquilon-docs

Update the Aquilon documentation
Merge pull request #43 from jrha/interprocess-flow

Interprocess flow
Update the JSON documentation
Update the documentation on the upgrade to Yum-SPMA

Mention the new template repositories
Make the code snippets prettier
Merge pull request #46 from piojo/yum-spma-update

Update docs on Yum upgrade