Changes in version 1.0.0.5 (2025-04-17)                 

    o   dataframePT(): Return a production table as a (readable) dataframe.  

                       Changes in version 1.0.0.4                       

    o   preBNF(): Preprocessor for macros (R-code) in grammar files.
	  Uses pastePart(), evenMacro(), exsistMacro()

                       Changes in version 1.0.0.3                       

    o   bindKvariables(): Helper for assigning variables to values (semantics)

    o   variableNamesBNF(): Generate k BNF rules for variables. 

    o   variableNamesLHS(): Generate an EBNF rule for k variables. 

                       Changes in version 1.0.0.2                       

    o   compileShortPT(): provides for each non-terminal symbol 
	at least one production rule which generates a list 
	of one or more terminal symbols.

    o   BNFhelpers.R: The functions needed for compileShortPT().

    o   printPT(): Print a production table in symbolic form.

                       Changes in version 1.0.0.1                       

    o   Documentation improved.

    o   newBNF(): eol are changed into spaces. 
	  Reason: Grammar symbols are separated by blanks.