default comments: true

Needed to keep copyright notices.  Will not keep `all`, only if "@license" or "@preserve" are inside the comment.
tweaked output inside <textarea>, [Tab], bytes saved
Much easier to [Tab] to fields & buttons now, improved copy from <textarea>, know # of bytes saved
improved comments flag: RegEx @license|@preserve|! should keep many top-line comments, & adding `!` is common after `/*`
Merge branch 'tomByrer-patch-1' into gh-pages

Changes to tabbing not kept.

Conflicts:
	index.html
	script.js