used for paypal links into email.

* If listener is not started, script try to run it but can't continue processus

Conflicts:
	scripts/invoices/rebuild_merge_pdf.php

scripts.

Conflicts:
	htdocs/install/mysql/tables/llx_cronjob.sql
	scripts/cron/cron_run_jobs.php

target.

Git required me to commit these changes

when success, <>0 if error).