[Versa] Issue 2

[Michael Olson]

I propose that we added backwards filters.  They make tons of sense to  
me.  I often find my self moving forward and backwards in the graph and  
cannot see any reason why I should be able to do something forwards,  
but not backwards.  I think the syntax should be similar to that for  
forward filters.

Additional, I think we should add a filter function to mike the filter  
operation.  Similar to the traverse function.

Mike

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Mike Olson                                                Principal  
Consultant
mike.olson at fourthought.com                +1 720 253 4662
Fourthought, Inc.                                       
http://Fourthought.com
PO Box 270590,                                       http://4Suite.org
Louisville, CO 80027-5009, USA
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