Let grdmix create a RGB image for red, green, blue grids in 0-255 range #8316
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Description of proposed changes
So far, grdmix and three input grid insisted on the -Ccpt option but if the three grids are red, green, blue grids in 0-255 range there is no need to force -C. This PR allows -C to be optional if given components.
All tests are unaffected.