Major change: All numerical values are treated as indepenent

In the original design of fussy, only variables were treated as independent variables. Numbers were treated as dependent variables and hence errors in expressions like 10pm1+10pm1 would give 20pm2 instead of 20pm1.41421 as one would expect for random errors.

This has now been changed to treat all numerical values as independent variates. People who may have downloaded fussy code before Aug. 2006 should update their code (from the CVS repository) and rebuild fussy to get this fix.