Many small changes to Section IV - proof of concept: maneage

Possibly the least trivial edit in this commit is that the previous text
appeared to state that it's normal to find that a project prepared with
`maneage` may be ... unbuildable.  Which would defeat our whole claim of
reproducibility!  Obviously, `maneage` is still in a rapid development
stage and might still have significant, not-yet-detected bugs.  But the
wording has to explain that this would constitute a bug in `Maneage` (in a
particular version of it), not an expected regular event. :) This commit
aims to fix that and other minor wording issues in IV.

Pdf word count 5855.

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