#998 Accurately check the configured mail transport and report information accordingly in the email.test page.
Add two "debug" transports for Swift mailer: Null and LogFile which are useful for staging environments where one does not want to send real emails.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3399 a333f486-631f-4898-b8df-5754b55c2be0
Integration of the Excel (XLSX) export feature... (regression fix)

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3400 a333f486-631f-4898-b8df-5754b55c2be0