- include Modernizr in the installer as well (needed for no-js/js)
- reference backend JS before body instead of in head
- added container markup for installer error msgs
- some styling for tables in the installer
- remove obsolete no-js/js styles for JS-less installer
- compensate for the lack of iconfonts (due to the style.css not
being piped through serendipity.css.php in the installer) by
using different markup which works with system fonts
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