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Attached is a second patch.
* Now includes input and output checksums. Checksums are now
 truncated to 16 characters each, otherwise the line is >80 columns.
* Fixes the doubled-up signature lines for type object slot default
 signatures. I ran "gcc -E" and wrote a quick script to print out
 all lines with doubled-up signatures. There were only two: divmod
 and rdivmod.
* Pretty sure this was in the first patch, but just thought I'd mention
 it: for functions using optional groups, we can't generate a legal
 signature. So Clinic kicks out the name of the function instead
 of "sig=", meaning that it puts back the docstring first line
 for human consumption! I am so clever, tee hee.