Attached files must not be deleted too early (FileCleaningTracker)

Steps to reproduce:

1. Create a document (note for instance).
2. Attach one or more files from the Files tab.
3. Do some actions, like creating a new document and attaching files to it.
   => Browse the 1st document. You get an error.
   In the logs, you have:

   18:16:29,490 WARN  [LocalBinaryManager] cannot fetch content at /Users/iblonde/Downloads/nuxeo-cap-7.2-I20150313_0121-tomcat-3/nxserver/data/binaries/data/b9/5d/b95dcad77a1807d213e5b46e66934a05 (file does not exist), check your configuration
   18:16:29,490 WARN  [DocumentModelResolver] Failed to get data model for 7c410262-48f1-47fa-91b8-8a50554fe45e:SchemaImpl(files)
   

The mechanism to clean up temporary files tracks non-temporary files.