Add retract_all() for Prolog engines #16
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This PR adds a
retract_all()function to all 3 Prolog engines (SWIPL, XSB and GNUProlog).retract_all()retracts all previously asserted clauses from the engine, which allows you to start clean without creating a new engine object.This fixes inconsistent behavior caused by the underlying engines: after calling release(), there is still knowledge asserted.
Needs to be tested (tests/test_retractall.py) on OSX