Matthew Sielski

Added findSpacingBetweenRows and findSpacingBetweenColumns which call optional protocol methods spacingBetweenRowsInGridView and spacingBetweenColumnsInGridView. I followed the existing model of having "find" functions which can be overloaded.

spacingBetweenRowsInGridView and spacingBetweenColumnsInGridView are defined as optional methods in the DTGridViewDataSource protocol but don't appear to be referenced anywhere else in the code, so they have no effect. I'm still...