reorganize netbib in order to simplify and reuse code
fix touchable fields
add tags to zentralblatt plugin
a bunch of bugfixes
do not produce python bytecode for tests
some minor tweaks for arxiv
fixes for zentralblatt
fix bugs for mathscinet
kill journal after last dot
add support for tags to mathscinet plugin
vastly improve tagging rules
little tweaks
update touchable fields
small tweaks