It has long irked me that when I type command-q to get selector 
completion, the suggestions are in apparently random order. 
(Actually, it's the order of the hash method on Symbols.)

The attached changeset fixes this.  It has a side effect: in order to 
sort all of the suggestions, the code has to find them all when 
command-q is first typed.  This takes a just perceptible amount of 
time, at least on my G3.  However, I have added a cache so that 
second and subsequent command-qs are lightning fast.

Because this changes the existing behaviour, I have flagged it as an 
ENH not as a FIX.  Some may not like it.  I suppose that the sorting 
could be a preference, but I just couldn't see adding a help balloon 
that reads "Checking this box will randomize the order in which 
command-q suggests completions to incomplete selectors and globals" 
;-)

ChangeSet attached.  The new code is also more readable, I believe, 
and I got to remove a method  (WeakSet>>do:after) that was there just 
to support the old code.

	Andrew
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