New: Content of predefined email come firstly from table
llx_c_email_template, then translation key.
Merge branch 'develop' of git@github.com:Dolibarr/dolibarr.git into develop
New: Add option MAIN_GENERATE_INVOICES_WITH_PICTURE to show picture onto
PDF like MAIN_GENERATE_PROPOSALS_WITH_PICTURE dir for proposals.
Qual: Removed duplicate page.
Fix: remove hook restriction !
QUAL: use the __METHOD__ magic constant