Revision history for Spp

1.00    2017-8-31
        init project.

1.01    2017-9-4
        mylisp grammar parse to Ast and save to Module, then could load rapid.
        Slist :[] used for str list for match import and export.
        add update() to modify grammar.

1.02    2017-9-4
        add ToMylisp.pm to Parse code to Mylisp itself.

1.03    2017-9-4
        add remove_ast_pos() as repl output interface.
        Module export mylisp_to_ast()

1.04    2017-9-4
        1. mylisp.pl add no argument help.
        2. tidy all source code.

1.05    2017-9-4
        sym 'else' and 'in' would not make special transfer,
        only judge is_else in if expr. 'in' would check it
        in lint-ast().
        load-module() could load from package name return text
        reject export keyword, function use def is exported.
        add def keyword