LP#1879983: tweak public catalog CSS

LP#1879983: tweak public catalog CSS

In particular, add CSS to support table-ish display of
a div-grid for form-per-row. For example:

 <div class="egtable">
     <form class="egtr" method="post" action="blah.html">
         <span class="egtd"><input type="text"/></span>
         <span class="egtd"><input type="text"/></span>
     </form>
     <div class="egtr">
         <span class="egtd">(cell data)</span>
         <span class="egtd">(cell data)</span>
     </div>
     ...
 </div>

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>