Resolve "installexternal.py fails to download METIS"
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What this MR does / why does DuMux need it:
Removing Metis, it is not used in the dumux repository Fixes #1240 (closed)
Notes for the reviewer
Before you request a review from someone, make sure to revise the following points:
CHANGELOG.md
.\n
character. Make sure there is no \ No newline at end of file
comment in "Changes" of this MR.Closes #1240 (closed)