ParseBibDeskByLabel.pl fixes 3 problems in parseBib.pl

This fixes three problems with parseBib.pl.
1.  parseBib.pl thinks the last URL in the XML entry is the file name, but often this is the doi, or other web reference.  I fixed that by telling it to look for <url>file(stuff)</url>.
2.  parseBib.pl searches the URLs greedily, so if there is another URL following the file name, it takes that as part of the file name.  I fixed this by adding the "?" in line 42.
3.  the title in the XML export can differ from that in the .bib export.  It is safer to use the <label> tag, in my opinion.  So I changed this too.  (see line 64).

This version "worked for me" :p