table: replaced direct use of several codes

changed to use alternate codes (assign, input begin, input assign,
  print double, print and variable reference)
modified print comma recreate to use name from table
modified print semicolon recreate to use name from table and alternate
  code to create an temporary rpn item for call to print recreate
modified print recreate to use name from table
made new table function constant (because recreator table is constant)
used type and data type in token equal operator instead of code
changed invalid code checks to use is code access function