[Groff] grap-1.36 clip and logscale patch

[Hartmut Henkel]

Hi,

there is a tiny patch to grap-1.36 (i beamed it over to the base
actually over 2 years ago, but it somehow got lost in space), that 1.
corrects for wrong clipping when in logscale, and 2. extends grap's
lower display limit to quantities less than 1e-6. This increases grap's
use, e. g. for electrical engineering when one calculates in picoAmperes
and such. I don't know whether the traditional original grap had this
weird 1e-6 limitation.

The patch with test files and PDF output (orig. + patched) can be found
here:

http://www.circuitwizard.de/misc/grap-1.36-clip-patch.tgz

Have fun!

Regards, Hartmut