unique_array

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          unique_array() - partitions an array of objects into groups

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          mixed unique_array( object *obarr, string separator, void |
          mixed skip ); mixed unique_array( mixed *arr, function f,
          void | mixed skip );

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          Groups objects together for which the `separator' function
          returns the same value. `obarr' should be an array of
          objects, other types are ignored.  The `separator' function
          is called only once in each object in `obarr'.  THe optional
          `skip' parameter enables a pre-filter on `obarr', skipping
          elements which match `skip'.  The second form works a bit
          differently.  each element of the array is passed to f and
          the elements are partitioned based on the return value of f.
          In particular, the array does not need to be composed of
          objects.

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          The return value is an array of arrays of objects on the
          form:

               ({
                   ({Same1:1, Same1:2, Same1:3, .... Same1:N }),
                   ({Same2:1, Same2:2, Same2:3, .... Same2:N }),
                   ({Same3:1, Same3:2, Same3:3, .... Same3:N }),
                                 ....
                   ({SameM:1, SameM:2, SameM:3, .... SameM:N }),
               })

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