[TYPO3-core] RFC #8433: Fixed scrolling issue in mod.php

[Mathias Schreiber [wmdb >]]

This is a SVN patch request.

Type: Bugfix / Code cleanup

Bugtracker References:
http://bugs.typo3.org/view.php?id=8433

Branches:
trunk

Problem:
CSS in typo3/styleheet.css disallows scrolling in BE modules using 
typo3/template.php

Solution:
a) Added overflow:auto to the corresponding selectors
b) changed width of typo3-bigDoc to 99% (due to Safari4, IE6, IE7, IE8 
and FF3 scrollbar incompatibilities

Notes:
I added a diff as well as a demo extension which displays a lot of text.
The function menu allows to add a fixed width div (850px) in order to 
trigger horizontal scrolling.

Small fix, reasonable impact :)

all the best
Mathias