Add "parapheur.fts.indexer.schedule" property, default to 1440, to disable job "FTSIndexerJob" by default

getDossierFromBureauAndName function now use "LANGUAGE_FTS_ALFRESCO" instead of base lucene for searching, as FTS does not need for node to be indexed to be found.
"dossierService.deleteDossier" is now only called from "handleDeleteDossier", to always use worker to handle deletion

This reverts commit 1eedd343.

Prepare 4.7.20

We have to check that user exists before setting or getting preferences

Fix issue on signature if saved position "Rectangle" class is rounded to int. Switch to Rectangle2D.Float to save stamp position to float