[Development] Updating "Serializing Qt Data Types" documentation

[Harri Porten]

On Tue, 23 Oct 2012, Mitch Curtis wrote:

> After https://codereview.qt-project.org/#change,37988, the "Serializing 
> Qt Data Types" page lists the QDataStream version as 13. I thought it'd 
> be a good idea to ask everyone who is interested to take a look and see 
> if the descriptions of the data types serialised are still accurate. If 
> they're not, please update the page (the path to which can be found in 
> the aforementioned patch).

Coincidentally we noticed a over-the-wire serialization problem today. 
With QVariant. But it's likely not an issue with above mentioned format 
version 13. Rather with a backward compat mode. Do I see it correctly that 
tests/ only cover 4.9 and 5.0 versions? Hmmm. I now realize that I can 
answer this question myself given that the coverage results we just 
posted...

  http://download.froglogic.com/public/qt5-squishcoco-report/QtBase/source_143.html (see QVariant::load() and save())

We'll investigate what's going on and submit a patch if it's a problem in
QVariant or QDataStream.

Harri.