Patch for custom.pl

During the investigation of some SSQLS problem, I noticed that the
custom.pl script generated unnecessary code for the set() functions, due
to the $set variable not being emptied after a pass. Have a look at your
custom-macros.h, look for "Begin Compare 3" and you'll notice that the
elements 1,1,2,1,2,3 are being assigned, instead of just 1,2,3.

While at it, I did some other changes, here is the summary:
- Reset $set.
- Have custom.pl work in strict+warning mode.
- Generate sql_cmp() for unsigned long and long too. Pros: I saw no 
  reason not to include them, and it allows to have long fields in 
  SQLSS structures.

All in all, nothing critical - for now. I'm indeed preparing a patch
that lets one have nullable fields in a SQLSS struct...

Best regards,
-Waba.

custom.patch
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