* Fix several typesetting errors and typos noticed by Sandro Tosi,
thanks for the notes! Closes: #483223
* Update several bits about release management/testing transitions
- and release-critical bugs. Closes: #483237
+ and release-critical bugs. Closes: #483237, #456494
* Update and rewrite the porting guidelines in chapter 5, bringing
the dev-ref up to the state of porting in the year 2008. Also
fixes several wording issues, such as possible misunderstandings