PhpBibliography 0.6

Version 0.6

* grouping by year is now available

* utility to find possible duplicate papers

* when in administrator mode (logged user) always
show edit/remove link for papers

* by default papers are listed with descending year

* when showing grouped papers the index can be avoided

* each paper now has a timestamp with last modification time
(used when ordering papers)

* when importing from DBLP, use the crossref bibitem to
add further information to the paper

* papers can be marked as private (visible only for logged users)

* when merging authors, checks that the two authors are not the same
author.