BibDocFile: fix for --hide --with-version

* Fixes an issue where --with-version argument was not taken into
  account in --hide and --unhide actions, causing all versions to be
  hidden instead of only the specific version.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
installation: add install target for recline.js
WebSearch: preview plugins initial release

* Adds initial infrastructure for previewing files.