added myself (Toon Knapen)

[SVN r24110]

more/blanket-permission.txt

@@ -31,3 +31,4 @@ Vladimir Prus (ghost@cs.msu.su)
 Jeff Garland (jeff - at - crystalclearsoftware.com) (see Boost list post of July 25, 2004 19:31:09 -0700)
 Thorsten Jørgen Ottosen (nesotto - at - cs.auc.dk)
 Daryle Walker (darylew - at - hotmail.com)
+Toon Knapen (toon dot knapen - at - fft.be)