Slc-linguatools

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- Updated the doctest setup to run in Plone4 [thomasw]
- Added possibility to make displaying a form optional, e.g. only if a
certain component is installed [thomasw]

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- Bugfix in PropertyForm: encode unicode to utf-8, otherwise setting the
property default_page breaks [thomasw]
- allow module utils for import in python scripts [pilz]

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- In plone.z3cform version 0.5.8 a major change was introduced that affects our
product. By overwriting update() and contents() of FormWrapper, we enable
support for versions >=0.5.8; with an ugly hack in contents(), we maintain
support for versions <=0.5.7 [thomasw]
- Fixed broken doctest for changing the workflow, introduced in 1.3.3 [thomasw]
- The AvailableIdsVocabulary now only returns translatable items [thomasw]
- New functionality: Add and remove marker interfaces [thomasw]
- Don't show the canonical lang in the vocabulary of avaiable langs [thomasw]

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- In the AvailableWorkflowTransitions vocabulary, return all available
transitions of a workflow, not just those available for the canonical's
state. The canonical might be published, while some translations are still
private [thomasw]

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- Reworked workflow handling. Instead of only "publish", now all transactions
available on the current object can be triggered [thomasw]
- "Translate this" now has an additional language field, so that only a subset
of the available languages may be chosen [thomasw]
- Ran the pep8 script and fixed most issues [thomasw]

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- Bugfix in linguatools.css: missing closing bracket. Thanks for the
heads-up, do3cc! [thomasw]