One documentation space per Version

The inspectIT documentation will copy the concept of Atlassian (vendor of confluence) w.r.t. documentation. For each version of inspectIT there will be a separate space in the wiki that reflects the documentation for this version. So users of an older version of inspectIT can still get a hold on the old documentation without being affected by the documentation changes that we did for the newer versions. In addition to that we profit from this approach as we can separate the documentation of the currently released version from the documentation of the version that is currently developed. inspectIT uses a documentation space per major release. This allows us to easily navigate our users to the correct documentation. Features and Improvements that are implemented in a newer version can thus be integrated in the documentation of the new version without confusing users of older versions.

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