[rekonq] saving history of tabs on quitting rekonq

[Anton Kreuzkamp]

Some weeks ago I've filed a reviewrequest "restore the tab's history when 
restoring a tab/session" (https://git.reviewboard.kde.org/r/100604/).

The qtwebkit-patch that is needed for writing the tab's history was rejected 
with the reason that it is possible with a QDataStream. Indeed it is, but only 
by saving the raw binary-stream.

Now I see 3 possibilities to organize that:
a) write the binary-stream as textNode into the xml-file
b) find some other way to organize the tab histories in one file (ideas wanted!)
c) create one file per tab and use directories for what we previously used xml-
tags

Opinions about which one to take are welcome :)

best regards, Anton