Fix test (method signature)

simplify mainatainer and email access

There were mutltiple bugs because of the inconsistent results from
getMaintainers(). This simplifies the result to a flat key=value array
where the type of the

simplify mainatainer and email access

There were mutltiple bugs because of the inconsistent results from
getMaintainers(). This simplifies the result to a flat key=value array
where the type of the value gives info about the type (user, group,
missing user).

E-Mail-Adresses are fetched via a separate method that returns a flat
array of email addresses only.

Simple tests have been added for both.

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style: some automatic code style adjustments, mostly whitespace

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