Comment 2 for bug 1177725

Additional info: The attached Tango-Palette.gpl file should replace the existing one in /share/palettes/

As it is simply adding two lines, one for black and one for white, it is just a very simple bugfix, and the palette adjustment has already been approved by all the original members of the Tango Project (including Hylke Bons, who I forgot to mention previously).