Override panels templates to handle empty regions and be more content-first in structure

Panels templates do not handle empty regions very well. First of all, it will show an empty column even if there is no content. If there is no content in a region, it should not output any markup. The css should be able to then rearrange the output to use up the empty space. This may get a bit ugly. Adaptive Theme has a css file autogenerated based on the theme configuration. If there is a way to prevent this, set it or find a way to take advantage of it.

The regions are also arranged in such a way that the content tends to be in the middle of the markup with less important information before it. This is problematic on small screens where the layout is a single column. The search pages are a good example of poor layout. Even though we have added fancy javascript to make the filters collapsible, they still exist above the primary content of the page.