DB rev 019 -> 020: LTFL support

DB rev 019 -> 020: LTFL support

Extends Christopher Hyde's patches to add LTFL support
as follows:

* adds fr-FR system preferences
* adds updatedatabase.pl

The three new system preferences are:

LibraryThingForLibrariesEnabled - turn ON to enable LTFL support
LibraryThingForLibrariesID - client ID for LTFL service
LibraryThingForLibrariesTabbedView - put LTFL content in tabs on bib detalis page

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>