[pnpgm] Vote 5 re spell modifier

[Alex Koponen]

I vote that EL modification of spell rolls should be:

Modify the spell roll by ONE (1) for each EL that the spell is known at 
PLUS by ONE (1) for each EL that the spell is CAST at.

Example: If know the spell at EL5 and cast at EL3 the total modifier 
would be 5+3=8. Thus 8 would be subtracted from the roll.

Reasons for this are that BOTH (EL known at) and (EL cast at) have 
arguments for being the basis for the modifier. This compromise allows 
both to modify the success roll and you don't have to multiply by 2, 
just add them together.
Known at has those with better understanding having a better chance.
Cast at has the additional oomph of the spell taken into account.