Tested with gcc_7.
Prerequisites: install last stable Vigra (1.11.1)
Changes made:
in caxes.h: precompiler includes befor libraries.
in cgp_structure.hxx: correcting obsolete omp syntax

reintroduced grain nr 0 indicating background.
statistics.txt opens and closes after each processing run to avoid losses produced by crashing cAxes.

main changes in functions:
import_data() - changing sign before 3rd component of tiny_vector
calculate_grains() - turn vectors down and negative z in the calculation of colatitude
other changes:
writing needless files (broken links to hdf5 files) disabled for the slim version