Filter by cluster and editable names

[djdt]

• Particles can now be filtered by their cluster id in the Filter dialog.
  • the largest cluster is id=1, 2nd largest id=2, ...
  • clusters are now calculated during updateResults and cluster IDs stored
• Names can now be edited in the sample, reference and results tab
  • names can be disabled from processing via the 'Set Enabled Items' right-click menu