CMS: addition of EOS file indexes to records

* Adds EOS file indexes to CMS Primary Datasets (all) and CMS Derived
  Datasets (records with PAT tuples).  (closes #113) (closes #172)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
templates: more prominent Validation on VM page

* Makes "Validation" step more prominent.  (closes #177)
visualise: updated "visualise event" page

* (addresses #84)
templates: rewording of VM validation instructions

* Rewords VM validation instructions.  (closes #177) (PR #188)
templates: propagation of "selection" information

* Propagates "selection" metadata information (taken from JSON field
  `methodology_note` aka MARC tag `567`) into various detailed record
  page templates.  (addresses #120)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
templates: propagation of "validation" information

* Propagates "validation" metadata information (taken from JSON field
  `action_note` aka MARC tag `583`) into various detailed record page
  templates.  (addresses #120)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
templates: propagation of "usage" information

* Propagates "usage" metadata information (taken from JSON field
  `constituent_unit_entry` aka MARC tag `774`) into various detailed
  record page templates.  (addresses #120)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: remove account traces

* (addresses #44)