Manually reverted unneeded include of metis.h
Revert "[autotools] Use METIS flags where appropriate."

This reverts commit 6132d0df82c635597f464ca28be64a8e01c1051e.
It (METIS) does not seem needed for compilation and the patch
forced the user and downstream modules to add additional compile
 and linker flags.
Revert "[cmake] Activate test for METIS and use it where appropriate."

This reverts commit 901b595479c2086f1bb3ff97b2bcfdcb72b2bb1c.
It (METIS) does not seem needed for compilation and the patch
forced the user and downstream modules to add additional compile
 and linker flags.