Convert data from GIMPS "Factoring Effort on Mersenne Numbers with no Known Factors" data to PFactor= lines:
ex: 1000037,67,5000000,5100000
ex: 100001219,71,,

Output type:
Assignment hash: (Pminus1 only, same for all assignments, leave blank to leave it off)
Pminus1 bounds: B1= B2= (left blank will enter previously-done bounds for each assignment)
Tests saved: