Update overview document with some real information
Correct capitalisation of Pan
Update client tools section

* Add UDP port number for cdp-listend.
* Include some information on components.
Add hyphen
Make feedback section a link so the contacts page
Link to ELFms
Mention patches in feedback
Update home page
Document the `aq add_router` command
Fix typos
Mention network environments.

Not much detail is given to avoid confusion.
Remove abbreviations.
Merge pull request #61 from piojo/routers

Document the `aq add_router` command
Merge pull request #58 from quattor/update_overview

Update overview document with some real information
Make large number even larger
Merge pull request #62 from jrha/grownups

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