#185 Enable import from APS (physics) prola cite

[Andrew]

Analagously to medline and citeseer, the american
physical society has indexed and published citation
information for its many journals (eleven) online.

At the prola.aps.org site, one can enter a journal,
volume, and page number to retrieve full publication
information, as well as a link to the full article (if
you are a subscriber). It'd be terrific if Jabref could
handle such queries automatically, populating the
bibtex fields and even retrieving the PDF if availible.

One could do this by mapping user input to the correct
URL. See

http://publish.aps.org/linkfaq.html

and the sample perl script. One would then need to
harvest the returned page for the data -- this may be
difficult, as the data is not tagged for machine
harvesting.