IMPORTANT: print-general-metadata new name for print-copyright

Summary:
 - Use the new name of this variable in your Makefiles.
 - In 'metadata.conf', remove fixed URL prefixes for DOIs
   ('https://doi.org/') or arXiv ('https://arxiv.org/abs').

Until now, the Make variable that would print the general metadata (of
whole project) into each to-be-published dataset was called
'print-copyright'! But it now does much more than simply printing the
copyright, it will also print a lot of metadata like arXiv ID, Zenodo DOI
and etc into plain-text outputs. The out-dated name could thus be
misleading and cause confusions.

With this commit, the variable is therefore called
'print-general-metadata'. After merging your project with the Maneage
branch, please replace any usage of 'print-copyright' to
'print-general-metadata'.

Also with this commit, 'README-hacking.md' mentions 'metadata.conf' and
'print-general-metadata' in the "Publication checklist" section and reminds
you to keep the first up to date, and use the second in your
to-be-published datasets.

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