[gradsusr] the 'set ccolor color#' don't take effect for gxout stnmark

[Qian Hao]

Hello, everyone

I found this mismatch between what the grads doc says and its actual
behavior. The grads html doc presents that
"For the graphics output type stnmark, the size and style of the mark are
controled by set digsiz<http://www.iges.org/grads/gadoc/gradcomdsetdigsiz.html>
 and set cmark <http://www.iges.org/grads/gadoc/gradcomdsetcmark.html>. To
turn off rainbow colorizing and use a single color instead, use set
ccolor<http://www.iges.org/grads/gadoc/gradcomdsetccolor.html>
 *color#*."
http://www.iges.org/grads/gadoc/gradcomdsetgxout.html
<http://www.iges.org/grads/gadoc/gradcomdsetgxout.html>But after 'set ccolor
1', the marks drew by grads were still rainbow colorized. Although i could
solve this problem by 'set rbcols 1', I think it's necessary to report this
issue.
-- 
此致
        敬礼！
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