[Bf-committers] Normalise patch

[Nathan Vegdahl]

Hey guys,
    I fixed a potential bug in the Normalise() code.  It was setting 
super-small vectors to <0,0,0>, which really isn't a good behavior for 
something that's supposed to return vectors of length 1.
    I simply changed it to set super-small vectors to a default <0,0,1> 
instead.

    It still returns zero for the length, so it can be checked.  But 
this way it has a graceful default behavior.

--Nathan "Cessen" Vegdahl