r52216: changed name of 'for' property to 'inheritFrom', in order to more precisely convey its true purpose

r52215: added improvement to be able to inherit properties in body columns from a specific header column
r48935: added test pages to the datatable QA test app

Keeping this private due to Williams references in the attachments.

The complete nature of the problem is discussed in "Phase 2 Plan.rtf" and illustrated in "Phase 2 cases.jpg".

On the branch, in revision 39065, I committed changes to the showcase application that improve its use as a demo of lazy loading, and how that would integrate with sorting and filtering. That would benefit from being merged to trunk. It also gives everything necessary for taking the attached "dataTableLazyLoading.xhtml" and putting that into:
icefaces/samples/showcase/showcase/src/main/webapp/resources/examples/ace/dataTable/dataTableLazyLoading.xhtml

In "dataTableLazyLoading.xhtml.rtf" there is the main code from "dataTableLazyLoading.xhtml" that uses highlighting to show the 4 key parts of code that illustrate the mis-correspondence issue [where the header column for "Chassis" using grouping but the body column for Name mis-inherits the grouping], and how to use the new ace:dataTable columnsInheritProperties="false" to half fix it. It's not a full fix, because with mis-corresponded columns, one can't use the tableConfigPanel to re-order columns without corrupting the view. Only the for property fix would completely fix everything.