Linux v2.6.13-rc1

Ok, a lot of things were pending after the 2.6.12 release, let's try to
start calming things down again.

Makefile

@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 6
-SUBLEVEL = 12
-EXTRAVERSION =
+SUBLEVEL = 13
+EXTRAVERSION =-rc1
 NAME=Woozy Numbat
 
 # *DOCUMENTATION*