UI: changed titles and links

* “external resources” => “About CMS Physics Objects” (closes #171)
* “VM/CMS” link changed in Primary-Datasets (closes #178)
* FIXED double numbering in “about/CMS” (closes #179)
* FIXED up/down arrow on collapse/expand (closes #180)
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>