added site,organization filter to external_network_instances list; fixed filter so that both can now be applied at the same time
Merge branch 'master' of ssh://github.com/GLab/ToMaTo into fixes__
fixed syntax error
added links to instance lists to organization/site info
added headers to dropdown list
Merge pull request #462 from t-gerhard/fixes__

added site,organization filter to external_network_instances list; fixed...