only change display name if the display name from the current user was changed; add correct display name to new user

change order, key -> uid and value -> display name, this way it is also possible to have non-unique display names

added parameter mail_smtpauthtype to set SMTP authentication type.

https://bugzilla.mozilla.org/show_bug.cgi?id=737064 *gnarf*

This is needed to ensure that the routing and linkTo() function for CSP
are available.

Simplify the code and remove a first  unnecessary (and non conform) '&' character when there are pending arguments

first commit with some infrastructure code

Added three additional mail_smtp.. parameters.
- mail_smtpdebug - enable debug messages to analyse SMTP problems.
- mail_smtptimeout - set SMTP timeout which is set to 10s by
  default and this is sometimes to short especially if a malware/
  spam scanner is used.
- mail_smtpsecure - force secure SMTP connections.