Add configuration setting to allow grids to have pre 5.0.0 click behavior
Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/7763dbb971bf1123#
I think, that new configuration variable called "StickyGridSelection" (yes/no) will come in handy.
This variable will change how record selection in grids will work:
sticky (from 5.0.0 version) - when one record is clicked and you click on another record, then both records are selected (no Ctrl/Shift is used)
non-sticky (before 5.0.0 version) - when one record is clicked and you click on another record, then only second record becomes selected (to select many records at once Ctrl/Shift should be used along with clicking)
