Cleaned up the introduction, definitions for provenance and lineage

Until now, the introduction had repeated several things and also had a
relatively long list of things to add in its end. Also, it was highly
focused to scientific papers.

With this commit, I effectively re-wrote it, with the starting paragraphs
becoming more industry-friendly, while also focusing on the scientific
cases. Many of the repetative parts were removed and the listed items in
the end were put into the text in a much better context.

Also, now that the name of the system involves "lineage" (and a lot of
focus is put on it in the start) the terms data provenance and lineage were
defined in the definition section.

Some other intersting points that I encountered during the research on
definitions were added to the discussion and final lists, and the DOI of
one reference paper was corrected.

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