stp/stp — pull request #32 by khooyp (2013-09-07 17:56:04+00:00)
Title: Move AlreadyPrintedSet from STPManager to LispPrinter and eliminate IsAlreadyPrinted and MarkAlreadyPrinted from ASTNode.

This refactoring eliminates a coupling between STPManager, LispPrinter and ASTNode.