including refactoring, disabling sourcepos for pipelines that
don't need it, and minimizing spec changes by disabling
sourcepos when not testing for it explicitly.
This adds 'data-sourcepos' to tags, indicating which
line of markdown it came from. Sets the stage for
intelligently manipulating specific lines of markdown.
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link contains personal token which attacker then use to act as the
original user (e.g. for sending comments under his/her identity).
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