Tabpane shortcodes: improved reporting of warnings and errors #1478
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This PR follows up on #1448: Tabpane warning: make it easier to find source page.
Only now I realized that we can do even better here and report not only the source page, but also the offending position (line number) inside the page.
This PR improves various error messsages, they all report the position of the offending code now. Also the wording was improved for several messages, making them easier to understand.