New: Can enter a vat payment of zero.

rule.

Fix: Cancel not working

Fix: Cancel not working

can move it during init of environment and use it globally.

upgrade were not yet received. So we prepare for GPL by uniformizing
licence text keys to GPL-3+. Will move later to AGPL if all answers are
positive.

Added missing translations, improved es_ES translations and translated untranslated text in modules admin page

Add: hooks and triggers for a lot of core modules (action/calendrier, deplacement, dons, tva, contact/tiers, contrat, product lines, expedition, fournisseur commandes et factures, fiche intervention, projet et taches)

Signed-off-by: Stephen L. <lrq3000@gmail.com>

Changed $DB to $db
lower-cased "Class"

replace all $html by $form with exceptions "$htmlname, $htmltooltip"

E_STRICT