Add some additionnal debug and warning messages for errors while parsing Applicative data in CSV.

Change-Id: I6a9bc5d9b5425c072f002f2f677b932d52f46a3a
Fix a bug in __str__ of AbstractMessage.

For some reasons, a message might not be attached to a session. Hence we should
test the value of the session attribute before using it in the __str__ method.

Change-Id: I506fb15eba28757dce78b9f83280ece06b3959ec
Add a getApplicativeData method in the Vocabulary class.

This method returns the applicative data of all the sessions contained
in the vocabulary.

Change-Id: I8f910a219d1bb3484eb7504532078c86bc86f105
Add a setDescription and an __str__ method on SearchResult and SearchTask classes.

Change-Id: Ia41477ba5cfae2bfd917027fbfdfe641bf43fdb6
Add a searchApplicativeDataInMessage method in the Searcher.

This method retrieves all the applicative data of the current project
and search them in the provided message.

Change-Id: I6e9ae3e6c0fe2f76351b34144b5f976690b589e8
Add ApplicativeData import in the all.py loader script.

Change-Id: I5732bdb12041be2aaaf1afe7ab2414a85a712e41