<a> incorrectly classified as block elements #13

In the following lines of htmlparser.js, <a>-tag seems to be classified as a block element.

But the w3c spec and this summary suggest it should be an inline element instead.

This causes an issue with parsing <a>-tag within an inline element, forcing the latter tag to close before the <a>-tag begins.

Minimal examples:

HTMLtoXML('<div>foo <span>bar</span> buz</div>')
// returns "<div>foo <span>bar</span> buz</div>"

HTMLtoXML('<span> hi  <a href=\"https://www.w3schools.com\">Visit W3Schools.com!</a></span>')
//returns "<span> hi  </span><a href=\"https://www.w3schools.com\">Visit W3Schools.com!</a>"