Slc.mailrouter

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- improved logging and error codes/messages, dump mails that produce errors
[reinhardt]
- add-mailrouter: actually show errors instead of just collecting them
[reinhardt]

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- added basic logging (from and to addresses) [reinhardt]
- include sender and context (if applicable) in error messages [reinhardt]
- catch AttributeError in MailToGroupRouter, too [reinhardt]

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- use X-Original-To header if present. Fixes 5117 [reinhardt]

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- assume email == login for folders like for groups [reinhardt]

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- fixed permission and getting user [reinhardt]
- use getMemberById for group mail, too [reinhardt]
- newSecurityManager does not make sense when mailing to group [reinhardt]
- enable validation - needs patterns update [chaoflow]
- made redirect work [pilz]
- use SecurityManager.checkPermission(), weird failures with
user.has_permission() [reinhardt]
- added gitignore [thomasw]
- an id for the main div [reinhardt]

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- initial release