Non-dataset target types selectable (using locally cached file): https://github.com/charmeproject/charme_plugin/issues/31
Error message appears correctly for old data: https://github.com/charmeproject/charme_plugin/issues/35
DOI resolution now using dx.doi.org: https://github.com/charmeproject/charme_plugin/issues/37
Search fields tooltips: https://github.com/charmeproject/charme_plugin/issues/38
Search results loaded just once on plugin load: https://github.com/charmeproject/charme_plugin/issues/39

Also minor corrections and comments.
Non-dataset targets selectable (using locally cached file): https://github.com/charmeproject/charme_plugin/issues/31
Error message appears correctly for old data: https://github.com/charmeproject/charme_plugin/issues/35
DOI resolution now using dx.doi.org: https://github.com/charmeproject/charme_plugin/issues/37
Search fields tooltips: https://github.com/charmeproject/charme_plugin/issues/38
Search results loaded only once on plugin load: https://github.com/charmeproject/charme_plugin/issues/39

Also minor corrections and comments.