toHTML - an expandable tree view

This new patch version for Pegged (from 0.4.0 released on 2017/02/28) introduces the new toHTML function can be used to generate an HTML file containing an expandable tree view that can be manipulated with an HTML5-compliant browser. See https://github.com/PhilippeSigaud/Pegged/wiki/Parse-Result for more details on this new fun way to explore parse results (and parse failures!).