CMS: update of `cms-tools-vm-image.xml`

* Corrects old entry links to wrong (LHCb) record.  (PR #697)
CMS: new VM image (1.0.0-rc7)

* Updates CMS VM image from 1.0.0-rc6 to 1.0.0-rc7.
  (closes #698)
UI: adds space on "About" page
records: shows given disclaimer if exists
config: updating the SITE_NAME displayed

* (closes #701)
records: corrects text in pop-up box

* (addresses #685)