$name was overwritten. So, this was fixed by adding a special
functionality when archive files are uploaded that replace existing
files with equal names; these are now deleted. This is docuemented
more clearly in the FAQ and it is also documented now that files
in the archive that are not listed in the manifest are not extracted.
add a new view and plain form to upload an archive; rename the internal
URLs, handlers and templates from submit to create for single downloads
and also add a help section about the new format as well as a detailed
FAQ entry. Archive files get a bigger upload limit (default: 20MB).
Next up: archive uploading, validation and processing.
