ICE-9109 - Converted scrollable ace:dataTable body row sizing to use dynamic stylesheet rather than first row inline sizes. Also prevented prototype extension from overwriting existing native implementations. This is preferable for performance and consistency reasons but may cause regressions due to expectations of our overwritten behaviour.

git-svn-id: http://anonsvn.icesoft.org/repo/icefaces3/trunk/icefaces@35580 1de00972-ac04-4911-a46b-06793c8d78d9