Further ios 7 rendering issues (happened only with ipad).
Fix for ios 7 ipad landscape bug

http://stackoverflow.com/questions/19012135/ios-7-ipad-safari-landscape-innerheight-outerheight-layout-issue
Merged MobileWebkitSupport from Rap 2.2. 

Reason: On chrome and home screen safari the website scrolls up on every
(virtual keyboard) key press when an input field has the focus. This
happened because of the focusIn / focusOut trick in MobileWebkit
support.
Drawback: Introduces new bug which also exists with rap 2.2: Focusing
the same field the second time is only possible by touching longer time
because the field still has some kind of foucs even though the virtual
keyboard is already hidden.
client.js built and activated ios 7 stacking bugfix also for iphones,
not only for ipads