#19 please allow /dev/null as input and output database

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nobody
None
5
2006-10-28
2006-10-28
Marc Haber
No

Hi,

for debugging, it might be useful to use /dev/null as
input _and_ as output database. This is currently not
allowed, but makes sense in this special case.

Please consider allowing this special case.

Greetings
Marc

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