Bug#864223: cadabra: switch dependency from texlive-math-extra to texlive-science

[Axel Beckert <abe@debian.org>]

Hi Andreas,

Andreas Beckmann wrote:
> texlive-math-extra is a real package in jessie but a virtual package
> provided by texlive-science in stretch. That causes a hard time for apt
> and it will likely remove cadabra instead of installing texlive-science
> during jessie->stretch upgrades.

If you haven't started preparing the upload already (nothing can be
seen in the git repo yet), I'd take care of this.

		Regards, Axel
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