Default paper: macros available for date of commits cited

Until now, Maneage only provided the commit hashes (of the project and
Maneage) as LaTeX macros to use in your paper. However, they are too
cryptic and not really human friendly (unless you have access to the Git
history on a computer).

With this commit, to make things easier for the readers, the date of both
commits are also available as LaTeX macros for use in the paper. The date
of the Maneage commit is also included in the acknowledgements.

Also, the paragraph above the acknowledgements has been updated with better
explanation on why adding this acknowledgement in the science papers is
good/necessary.

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