only produce output if somethign goes wrong

for blacklisting them.

reason they were blacklisted, we can handle them as generic Handles.

reason they were excluded.

late...

values would overwrite the next value.

Also moved %c and %Z out of there, even though they are standard,
because these are locale dependent (and e.g. on Windows and Mac they
return different strings).  Finally, sorted the tables slightly
different, to match my standard docs better (%a before %A).

 -- initialize length to DEFAULTALLOC and not 0
 -- resize string before returning (to remove '\000' padding)

Also converted some compression routines to use PyString instead of
buffer.