Revert the crossref changes to bib file

Added in 7cc4f9dd2fd49de6717551d4e90ba87e582273df but I don't think
the world is ready for clever use of crossref just yet. In particular
it

 1. Seems to give higher status to conference proceedings that are
    used more than once (as we did not change all conference proceedings
    to use crossref)
 2. The bibliography style didn't handle it properly and added extra
    page numbers.

It also doesn't seem to save us any space in the references section.
Remove address and publisher from bib files

It wasn't present in every entry so don't use it at all.