allow plugins to listen on search tab change
When tab in search result panel changes call listener that can be handled by plugin.
This is requested by this request: https://git-r3lab.uni.lu/minerva/plugins/exploration/issues/5
When tab in search result panel changes call listener that can be handled by plugin.
This is requested by this request: https://git-r3lab.uni.lu/minerva/plugins/exploration/issues/5