Products.printingmailhost

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- Restore compatability with plone.api.
[pbauer]

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- Add support Python 3
[pbauer]

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- Check environment variables in Zope2 `initialize` instead of import time.
This allows to configure environment-vars in zope.conf and use them when
starting the instance with slc.zopescript
[fRiSi]

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- Treat ``FIXED_ADDRESS`` as a list. Previously, depending on your
Plone version. a fixed address could get interpreted as a list of
single-character email addresses, which of course does not work.
Now it works properly. You can also give a list of addresses by
separating them using spaces: ``oneexample.org twoexample.org``.
Fixes https://github.com/collective/Products.PrintingMailHost/issues/4
[maurits]

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- Add environment variable ``PRINTING_MAILHOST_FIXED_ADDRESS`` to send
all emails to a single, fixed address. PrintingMailHost still needs
to be enabled, so this is in addition to printing.
https://github.com/collective/Products.PrintingMailHost/issues/2
[maurits]

- Since we can enable PMH via an environment variable and thus when not
running in debug mode / foreground, emails are no longer printed, but
written to the zope event log.
[pysailor]

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- Also patch (Secure)MaildropHost when available.
[maurits]