Iulian Grindeanu authored Sep 17, 2015 and vijaysm committed Aug 31, 2016

* TAGS: example is for int and double dense tags only
  example is for tag existing in the file already
  one of the tags is exchanged, the other one not
  (so the values on ghosts will be default, 0.0)

* Change the name of connectivity method
  instead of element connectivity, call it BlockElementConnectivity
  - add a connectivity method on single element
  - add info method on all visible elements