Linux 2.6.13-rc6

Last (?) -rc, partly brought on by the aic7xxx performance fixes (ie get
them tested in an -rc release before the real 2.6.13).

Makefile

 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 13
-EXTRAVERSION =-rc5
+EXTRAVERSION =-rc6
 NAME=Woozy Numbat
 
 # *DOCUMENTATION*