Critical Description
Most macros of the projectdoc Toolbox only work with projectdoc document. While it is not difficult to transform Confluence page to a projectdoc document, new users typically do no know this constraint. When they try the toolbox, they will almost immediately fall into this trap.
Therefore we should enhance the error messages once a user tries to use macros relying on the Properties Document Marker Macro. And we should enhance macros to actually deal with Confluence pages. The Transclusion Macro is one of them. While there are features that can only be provided by accessing document properties, others should work (maybe with some limitations) without.
We should allow transclusions from sections and content regardless of the transcluded source entity is a Confluence page or projectdoc document.
