No need IF NOT EXISTS at install time

No need IF NOT EXISTS at install time

without creating/renaming databases.

Fix by adding MAIN_USE_OLD_SEARCH_FORM to restore a way for backward
compatibility
Fix to have delay for payment term at least 1 day (to avoid immediate
warning after creation of an invoice)

mode (one price, price per level, ...) were impacted. Localtax setup
were lost.

name can be longer than 32)

to use them. Will be done into 4.0

Fix: a minor error was locking the full upgrade process.