oslquery improvements: apply the searchpath; improved error messages; apply the .oso extension if not already done. Includes fixes to trac#42.  See http://reviewboard/r/544
oslquery improvements: apply the searchpath; improved error messages;
apply the .oso extension if not already done.
Includes fixes to trac#42.  See http://reviewboard/r/544

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