added recreator class with support for simple expressions

recreator class has table reference, holding string stack and output
string members, with access functions for stack and output string for
recreate functions, plus the main recreate function with rpn list input
and string output

added recreate function pointer to table entries with access function
added operand recreate function for variables and numeric constants
added recreate function for string constants (adds quotes)
added recreate functions for unary and binary operators
added new table name access function with token point argument
modified tester run and translate input to support recreator
updated expression test #1 recreate output expected results file