Arithmetic comparisons to be same way around

Arithmetic comparisons to be same way around

In writing arithmetic comparisons, use "<" and "<=" rather than
">" and ">=". For some justification, read this:

http://thread.gmane.org/gmane.comp.version-control.git/3903/focus=4126

Signed-off-by: Sami Kerola <kerolasa@iki.fi>