K 10
svn:author
V 4
bapt
K 8
svn:date
V 27
2017-03-12T03:49:05.679504Z
K 7
svn:log
V 183
Implement a stub --horizon-lines=NUM for compatibility with GNU diff3

some options of GNU diff3 would call diff with --horizon-lines, rcs is depending
on that.

Reported by:	antoine

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