Linux v2.6.15-rc6

Also renamed in honor of Portland being snowed in and everybody sliding
around on the highways like greased pumpkins.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Makefile

 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 15
-EXTRAVERSION =-rc5
-NAME=Affluent Albatross
+EXTRAVERSION =-rc6
+NAME=Sliding Snow Leopard
 
 # *DOCUMENTATION*
 # To see a list of typical targets execute "make help"