Implemented the Additive and Substractive modes, missing from the DOS version
git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@286 416bcca6-2ee7-4201-b75f-2eb2f807beb1
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git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@286 416bcca6-2ee7-4201-b75f-2eb2f807beb1