added plugins for csv data
added a separator to a pulldown menu of the pipeline panel
use request_data
accept NumberOfItemsSpec
keep kwargs
added a simple inspector for ParticleSpaceVisualizerNode
added a faster, but a bit sloppy data source
a scale length for particle_space_visualizer is now mutable
Visual colors can be changed through a Listbox in the inspector
avoid rendering for non-existing species
allow a multiple selection and context menu
show a progress bar when loading csv files
show a visualizer and inspector by doubleclick
tmp code
Merge branch 'master' into kaizu