Semantically equivalent to the sequence below, except that the query is 
executed in (and in the Prolog context of) the pengine server referred 
to by URL, rather than locally.
  copy_term_nat(Query, Copy),  % attributes are not copied to the server
  call(Copy),			 % executed on server at URL
  Query = Copy.
Valid options are:
- chunk(+IntegerOrFalse)
 - Can be used to reduce the number of network roundtrips being made. See pengine_ask/3.
 
- timeout(+Time)
 - Wait at most Time seconds for the next event from the server. 
The default is defined by the setting 
pengines:time_limit. 
Remaining options (except the server option) are passed to
pengine_create/1.