remove fissures
remove not reimplemented 3dloc
change plotting of all Axes/Picks
many changes, mostly regarding picks/arrivals, plotting, resource_ids:

 - plotting of pick lines works
 - plotting of pick label strings works
 - resource_ids need to get set new whenever pick is changed, otherwise
   the arrival stays associated with a wrong pick
 - handling of picks/arrivals seems ok for this workflow
    - get event with picks only
    - locate with nlloc
    - change some picks
    - relocate
 - some obsolete code removed