Make table based templates fit 100% of available view

richCollapsibleSubtable, dataTable and dataGrid are dataTable based templates and they use fixed width by default (~480px), which doesn't fit whole available view even lower screen resolution. Set width to 100% on top dataTable frame to fix this.
Fix TestDragSourceRF12256: testType and customIndicator

Add indicator initialization + move dragIndicator into middle of drop target since with absolut positioning it doesn't work reliable when move over the left top corner of drop target (in fact the indicator is outside target for ~10px and indicator then corretly doens't indicate expected state.
Fix DnD tests for RF-12256 simulation

Since it is absolutely positioned drag area example, this caused problems with view scrolling during the test on platforms with lower screen resolution. Tests often and unreliably failed  with error during the view scroll from drag source to drop area, since drag source was above due to absolute position. But because of the reported problem was drag indicator for absolutely positioned drag source, decided to move drag source to the same Y dimension as drag target to avoid view scroll during move to drop area.