MailEnable conversion

The following are converted:
1. Domains
2. Mailboxes
	- mail
	- passwords
	- autoresponders
	- first forward of forward list - any additional forwards are discarded
	- delete message on forward option
	- size limits
3. Groups
4. Lists
	- not every feature moves over - subscribers and moderator do
		have to inquire about other settings

Note 1: Postoffices are converted as domain aliases to the primary domain
	in the postoffice (the primary domain is selected during the conversion).
	any extra domains in the postoffice are also converted as domain aliases 
	to the primary domain.
Note 2: MailEnable listens to all ip's by default. SmarterMail listens on individual 
	ip's selected for each domain.  The converter requires a default ip that 
	all domains will be set to listen on.  If you listen on multiple ip's 
	you will have to manually change them after the conversion.