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* Schleuder: port invocation syntax to Schleuder 3.

Schleuder 2.x has been deprecated for a while. It's not maintained
anymore, has obsolete dependencies, and has been superseded by
Schleuder 3.

The new syntax is documented on
https://schleuder.org/schleuder/docs/server-admins.html#postfix

* compatibility with Schleuder 2 can be used this way:

  use_schleuder => 2

* support explicitly setting use_schleuder to 3.

A Boolean "true" value will thus mean "assume the latest upstream Schleuder
release". For now, that's 3.x so setting this parameter to 3 is equivalent
to setting it to true. But once Schleuder 4 is out, this may change,
so better provide users a way to hard-code the fact they have Schleuder 3.

Add postfix::mailalias, that creates an email alias and updates the binary version of the local alias database. (#233)

Supersedes #115.

Ensure that, if a map file is removed but the associated source
file is not touched, the map file is regenerated by puppet.

These files do not contain sensitive data, so keep the default files
permissions.

sendmail(1) reads parts of it's configuration from the main.cf file.
When the file is not readable, the command invocation will fail with the
following error:

fatal: open /etc/postfix/main.cf: Permission denied

The parameters read from main.cf are documented here:
http://www.postfix.org/sendmail.1.html