deparse drops () sometimes (PR#169)

[p.dalgaard@biostat.ku.dk]

Shortest example is this:

> function()(g)()
function () 
(g)

It executes OK, but editing a function with one of these in will
introduce an error in an uexpected place.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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