Provide better usability for the "Downloads" paragraph

The "Download" paragraph in Magnolia, which based on my interaction with Ryszard is a stop gap arrangement, can be improved to make it more admin friendly. Here's some of the suggestions:

• Consider this - you have already 5 downloads added in the downloads paragraph. After a few days, you release a new version and want to add this to the download page. Editing this download paragraph, you realize that you have to first "push" (by copy/paste) all the existing 5 downloads to one level down and then add the new download at the top of the list. This is not user/admin friendly right now.

• The number of downloads that can be added is fixed (i guess 10). I think a better way would be to provide a button "Add Download" which on clicking will bring up all the fields that need to be filled for the new download

• Make the number of columns in the download table configurable, allowing any custom columns like "Release Notes" to be added

• A download counter. I think this can be a lower priority since i am not too sure that the counter was accurate earlier. The sourceforge download counter maintains a more accurate count