removed: old shader (SHL) implementation
install fcd2code program separately to preserve exec permission

Cmake's INSTALL(DIRECTORY ...) does not seem to preserve
permission on the fcd2code script :(
fix: missing OSGViewarea.h include
fixed: type mismatch/compile error (AUTOINIT_THREADS mode)
fixed: SimpleSHLChunk vars not updated in cluster (parent not transmitted correctly)