Updated prototype code to version 1.7. Collated code found in 'dom', 'lang' and 'ajax' directories in their corresponding master files.

It seems that this change may be responsible for a set of regressions:

New regression test failures detected on icefaces1.8 trunk revision# 24679
Server: tomcat6
Browser: FF3.6, IE8 & GoogleChrome10:

1. ICE-3290 - modal popup screen expanding problem (all browsers)
2. ICE-2722 on IE: the panel popup auto positions itself after drag n drop.

Last tested/known working revision was #24605 / May 17th.

Prototype 1.7 upgrade causing regression failures with the Draggable Tree Table EE Composite Comp.

Re-applied viewport calculation changes introduced for ICE-3308. This fixes ICE-2722 regression.

Updated Scriptaculous code to version 1.9 to resolve the incompatibilities between 1.8.* version and the new Prototype 1.7 code.

Note that QA reports that 1. ICE-3290 - modal popup screen expanding problem (all browsers) is still failing with Scriptaculous 1.9. The issue is that the background blocking div grows incrementally, and the panelPopup moves around slightly (autocentred?) as a result.

In IE and FF Prototype overrides the default implementation of the Element.viewportOffset function to use the native HTMLElement.getBoundingClientRect(), most probably for increase performance. Unfortunately the overriding function doesn't give the same results as the default implementation.

The fix for ICE-3290 regression removed the overriding of the Element.viewportOffset function even in browsers that do support the getBoundingClientRect() function.