splitting up an inline-signed OpenPGP message

[Daniel Kahn Gillmor]

Thanks to everyone for their feedback on this.

The answer was indeed that i had one trailing newline too-many.

i didn't need to convert lf → crlf; gpgv is smart enough to see that a
signature is a text signature and handle the line-end munging itself.

The resultant code is attached below, in both a perl and a C version.

Werner, if you're up for shipping the C version as
tools/openpgp-split-clearsigned.c, i'm happy to contribute it to GnuPG.
It seems too small for me to be worth packaging and distributing
independently.  Both versions are GPL v3 or any later version.

     --dkg

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