Changes: 1) I changed the parameter names for Sum, to sumvar'arg, sumfrom'arg, etcetera.    You can use these in your patterns! Something I should perhaps make more    explicit in the documentation. 2) modified some of the code in SumFunc that declared functions, to fix the "41" rules. 3) Added geometric series 4) Added Some HoldArg commands for SumFunc 5) Fixed the summing of sums
Changes:
1) I changed the parameter names for Sum, to sumvar'arg, sumfrom'arg, etcetera.
   You can use these in your patterns! Something I should perhaps make more
   explicit in the documentation.
2) modified some of the code in SumFunc that declared functions, to fix the "41" rules.
3) Added geometric series
4) Added Some HoldArg commands for SumFunc
5) Fixed the summing of sums

MateuszSnamina/yacas,martanoga/yacas,qwert2003/yacas,grzegorzmazur/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,tomaszkrysiuk/yacas,tomaszkrysiuk/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,martanoga/yacas,tomaszkrysiuk/yacas,martanoga/yacas,qwert2003/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,martanoga/yacas,qwert2003/yacas,tomaszkrysiuk/yacas,tomaszkrysiuk/yacas,qwert2003/yacas,qwert2003/yacas,qwert2003/yacas,grzegorzmazur/yacas,qwert2003/yacas,martanoga/yacas,tomaszkrysiuk/yacas,MateuszSnamina/yacas,martanoga/yacas,MateuszSnamina/yacas,tomaszkrysiuk/yacas,martanoga/yacas,grzegorzmazur/yacas