Ann: func pack updates

In v0.3.0 the func pack supports functions similar to Carlo's lifter
module.  For example,

  ?-  length(L, ~ is 1+2).
  L = [_G185, _G188, _G191].

SWI-Prolog 7 dicts are now treated as functions too.  This lets you use
`Dict $ key` to lookup a key's value.  Unlike V7's dot notation, looking up
a missing key fails instead of throwing an exception.

Because dicts are functions like everything else, you can compose
dictionaries together with other functions to produce still more functions.
 I'm not sure how practical this feature will be, but it took no extra code
and makes me smile :-)

-- 
Michael
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