huge HTML cleanup via mass search-and-replace

- rm useless attributes like <script language=JavaScript>
- rm many absolute URLs, ref #2
- updated, async Google Analytics code on all pages
- no need for HTML comments inside style/script tags
- excess white space at end of line or end of file
- probably some other stuff, this is a huge commit as you can see
js files affected by search-replace

mostly explanatory comments & white space at EOL