histograms: "loading" control information

* Adds control information and "Loading..." status.  (PR #618)
CMS: FFT for Ana's github code release v1.0.0

* Adds FFT for Ana's github code release v1.0.0.  Amends MARCXML files
  accordingly.  (addresses #89)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: FFT for Tom's github code release v1.0.0

* Adds FFT for Tom's github code release v1.0.0.  Amends MARCXML files
  accordingly.  (addresses #71) (addresses #89)

* Improves indentation of `cms-tools-dimuon-filter.xml`.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: update of `cms-tools-dimuon-filter.xml`

* Adds code licence. (addresses #71) (PR #623)