Publications ordering

Publications are ordered alphabetically within a year. This is problematic since we need to be able to manage the ordering.

So maybe the system could do the following:
- use upload date as the default
- allow user to edit the upload date (maybe down to hours / minutes)
- allow users to create and assign tags to publications, in which case papers with the same tag get grouped within each year
- add a “promote” flag per tag that would promote the papers with that tag to another page
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