fixtures: change description of ATLAS

* Changes description of ATLAS.  (PR #490)
CMS: adds CDATA tags for embedded HTML in fixtures
UI: changes text in "Download" button on records

* ( addresses #443)
collections: fixes error in "collection_overview"
records: updated record-brief with "Global Tag"
templates: propagate recent metadata additions

* ( addresses #480 )
UI: link to collections fixed
ALICE: update of `alice-derived-datasets.xml`

* Updates `alice-derived-datasets.xml` with number of events and more.
  (addresses #405) (PR #463)
ATLAS: new file `atlas-external-resources.xml`

* Creates new file `atlas-external-resources.xml`.
  (addresses #487) (PR #494)
docs: add new data files for installation

* Adds new data files to installation instructions.  (see PR #494)

* Cleans the wording slightly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
records: adds default templates + adds macros

* adds complete default templates for records
* creates macros to manipulate “_note” metadata
* ( addresses #480 )
UI: standardising text for "VM"

* replaces “Working Environments” -> “Virtual Machines”
* ( addresses #425 )
UI: adds option to exclude experiment from a page

* ( addresses #477)
UI: removes ATLAS VM section + page

* (closes #477)
LHCb: introduce VM page

* ( closes #499)
LHCb: introduce getting started page

* (closes #500)
LHCb: update of `lhcb-external-resources.xml`

* Amends FIXME text for LHCb external resources file.
  (closes #486) (PR #496)
fixtures: LHCb collection description update

* Updates tiny descriptions for LHCb collections.
  (closes #497) (PR #496)
LHCb: addition of EOS file indexes

* Adds EOS file indexes files for upload.  Amends MARCXML file and
  installation instructions accordingly.  (closes #495)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: addition of EOS file indexes

* Adds EOS file indexes files for upload.  Amends MARCXML file and
  installation instructions accordingly.  (closes #512)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>