New: Start to work on a cron module

Conflicts:
	htdocs/langs/bg_BG/admin.lang
	htdocs/langs/el_GR/admin.lang
	htdocs/langs/en_US/admin.lang
	htdocs/langs/nl_BE/admin.lang
	htdocs/langs/pt_PT/admin.lang
	htdocs/langs/tr_TR/admin.lang
	htdocs/langs/zh_TW/admin.lang
	test/soapui/Dolibarr-soapui-project.xml