1) Faster P-1 stage 2.
2) Faster ECM stage 1 and stage 2.
3) Gwnum library overhauled. Many functions deprecated. Replaced by more powerful gwmul3. New functions
that compute (a+b)*c and (a-b)*c with less memory accesses. Faster conversion to and from binary.
4) ECM and P-1 can find the best B2 value for the amount of memory prime95 is allowed to use. For ECM,
this happens when the worktodo.txt line sets B2=100*B1 which is the default assignment from the PrimeNet
server. For P-1, the best B2 is chosen when the worktodo.txt line specifies the trial factoring depth.
For example, "Pminus1=1,2,20000003,-1,500000,0,70" chooses the best B2 bound for B1=500000 given that
M20000003 has been trial factored to 2^70.
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