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)