[cairo] [PATCH] xsvg - support png to stdout using "-" filename

[John Ellson]

This proposed change to xsvg adds support for a special case filename
of "-" to mean stdout when used with the -p option.

The change also documents the use of "-" for stdin and stdout in --help 
output.


This patch permits xsvg to be used as an svg-to-png filter in pipes, e.g:

    echo 'digraph G {A->B}' | dot -Tsvg | xsvg -p - - | xv -


John Ellson
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