Enable translucent brush with sprite into 256 colour sprites
Detail: Previously this combination was disabled due to painting in odd colours when the target sprite was 256 colours but with no palette. From ColourTrans 1.96 and later a default palette is substituted. Add a runtime check that the appropriate version is available; implicitly it will be since Paint is in the same ROM as ColourTrans, but for the disc copy provided for RISC OS 3.50 it isn't. Admin: Submission for Paint bounty.