* Relabeled the "Notes" column to "Translations" since that's what it
really is.
* Replaced the Download label with an icon and moved it to the add-on
names column.
* Restyled add-on version/author a bit.
* Add-on type is now more or less aligned to the middle of the icon
(regardless of what the cell height actually is -- there can be extra
empty space below the type line if the add-on title is too long, for
instance).
This also adds SVG icons to be used in table headers instead of GIF
images for browsers that support SVG in background-image. It makes
things scale better for high DPI screens.
After my last change dealing with this issue, I noticed that descriptions
with <pre> had an extra blank line at the top. Adding top-margin to the
CSS file made this go away, but it also made the <br/> superfluous. Thus,
it is simpler just to have every description use <pre> instead of <br/>.
This should finally resolve everything having to do with the add-on
descriptions.
If I'd noticed that the re module hadn't been imported, I probably wouldn't
have considered URL linking to be important enough to do so. Since I've
already written the code, however, I'll keep it.
After looking into it some more, I think I've figured out how to handle <pre>
in the CSS. So, use that, when description has more than one line.
Also, go to re.sub for turning URLs into links. The version of Python I was
testing my code on wasn't properly handling backreferences in the replacement
string when in the form "\#", causing me to use finditer instead of sub. But
I've discovered that it does handle backreferences in the form "\g<#>". So
switch to much simpler re.sub code.
