turned -DFORCE_VECTORIZATION off by default in flags.guess to be safe (see https://github.com/geodynamics/specfem3d/issues/81 for more details).
Also removed a few unused variables in src/shared/get_global.f90
Merge pull request #137 from komatits/devel

turned -DFORCE_VECTORIZATION off by default in flags.guess to be safe (s...