two-column income-statement patch

[Andrew Sackville-West]

As was discussed on irc yesterday
(http://lists.gnucash.org/logs/2007/10/2007-10-17.html#T13:39:55),
here is a patch for a two-column income-statement. Seems kinda silly
to me, but apparently the germans really want this, so there it is ;)

meanwhile, its also here:
http://bugzilla.gnome.org/show_bug.cgi?id=488004

thanks

A
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