Convert the tabatkins grammar to a nearly.js grammar

[sfkleach]

We want to converge on a single javascript friendly grammar format & Nearly is our tool of choice. Please convert pop11_grammar_tabatkins.txt.

[edgardozoppi]

Nearly syntax is actually very similar to this syntax: pop11_grammar_ebnf.txt and it has a built-in tool to generate Tabatkins railroads diagrams from it. So we could have only one grammar file in EBNF Nearly format and automatically generate a parser and charts from it. This way we can get rid of pop11_grammar_tabatkins.txt file.