Left out some deriv cases for sub and div.
Left out some deriv cases for sub and div.

tectronics/openshadinglanguage,code-google-com/openshadinglanguage,qdtk/openshadinglanguage,qdtk/openshadinglanguage,tectronics/openshadinglanguage,qdtk/openshadinglanguage,h3rb/openshadinglanguage,h3rb/openshadinglanguage,code-google-com/openshadinglanguage,tectronics/openshadinglanguage,code-google-com/openshadinglanguage,tectronics/openshadinglanguage,code-google-com/openshadinglanguage,qdtk/openshadinglanguage,h3rb/openshadinglanguage,h3rb/openshadinglanguage