Noticed some quirky behavior with global variables when REPL was in a different

Noticed some quirky behavior with global variables when REPL was in a different
module from interpreter so I switched it back temporarily.

minor refactoring to Chart.update and Chart.insert

The new Term object hasn't been pushed all the way thru. The old-style (fn,idx)
tuples are what get stored in the chart.

   TODO: track down and fix this.

Ghetto way to answer queries.

  :- query phrase(X,I,K)

in(2) :- query rewrite(X,I,K)
out(2) bag= _VALUE is rewrite(X,I,K), &result(&(rewrite(X,I,K)), _VALUE).
=============
out(2) := BAggregator({result(rewrite('PP','P','NP'),1): 1,
                       result(rewrite('VP','VP','PP'),1): 1,
                       ...
                       })