merge master -Dnone -Ihotfix -Ssuccess-only

Repository: ome/omero-server
Excluded PRs:
  - PR 168 scuniff 'ome#167  equals() comparing objects of different types' (user: scuniff)
  - PR 166 kkoz 'Experimenter group cache' (user: kkoz)
  - PR 152 jburel 'Set class in doc' (user: jburel)
  - PR 151 jburel 'bump org.openmicroscopy.project 5.6.0' (user: jburel)
  - PR 116 dominikl 'Add method to get pixel min max' (user: dominikl)
  - PR 61 joshmoore 'Pass user executor to rendering tasks' (user: joshmoore)
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