CMS: richer metadata in primary dataset records

* Enriches metadata of CMS Primary Dataset records.
  (addresses #34) (PR #91)

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
README: new `force-recids` option for demo site

* Adds `-e force-recids` option to populate demo site with wanted record
  IDs.  (references #34) (references PR #91)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: new derived PAT tuples from Ana

* Adds new derived PAT tuples from Ana.  (addresses #34) (PR #98)

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
CMS: new tool records from Ana

* Adds new CMS Tools records from Ana.  (addresses #34) (PR #99)

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
CMS: richer event display records

* Enriches metadata of event display records.  (addresses #34) (PR #102)

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
CMS: removal of derived dataset example

* Removes derived dataset example now that event display records have
  been updated in e538be0b9ea0c2bbe1d8b946e5fe6b2f0f2b5fa5.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: removal of old CMS derived dataset files

* Removes old CMS derived dataset files that were used for demo purposes
  only.  They have been superseded by `cms-eventdisplay-files.xml`.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
README: instructions to load all demo files

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: fix for missing FFT in event display records

* After recent merge of richer metadata for event display files
  (PR #102), the `FFT` tags are gone, meaning no "*.ig" files on the
  demo site.  This commit fixes the problem by adding them back.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
URL: "education" links on entry points FIX

* correct links for modified pages (closes #97)
UI: layout + links in educate/research page

* updated layout of  educate/research page
* corrected links for site navigation
footer: updated footer nav

* (addresses #75)