Prerequisites link broken in INSTALL.md (#273)
Prerequisites link broken in INSTALL.md (#273)

* Fix INSTALL.md toc

 Fixes #273 reported by @milancurcic, cheers! :bow:
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* Update some info in INSTALL.md

 Discuss deprecation of `FC=mpif90` and `CC=mpicc` in favor of
 `FC=gfortran` and `CC=gcc` so that CMake's `FindMPI` can properly work
 it's magic.
 [ci skip]

* Fix enumeration in INSTALL.md#cmake

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zbeekman/opencoarrays,jerryd/opencoarrays,jerryd/opencoarrays,sourceryinstitute/opencoarrays,zbeekman/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,zbeekman/opencoarrays,jerryd/opencoarrays