Further Smoke Testing, Patching

- Edge cases in Lexer.js, ParserBlock.js,
- Offset mistakes in `parseList()`. (ParserBlock.js)
- Infinite Loop in `parsePara()` (ParserBlock.js)

- Temporarily disable auto-correction in ASTNode.
- Use JSON.stringify in main.js
- Simplify test models; Just print the AST
  for now using JSON.stringify().