NULL by defaut. 

Fix date of supplier proposal missing.

llx_ecm_files)

managed by submodules like are the templates of document or engines to
select emailing targets (scan of a dedicated dir)

to keep it if required.

(sometimes we need, sometimes not).

is used with multicompany

third-sharing is used with multicompany

FIX Missing import key on social contributions and missing class to
manage type of social contributions.