Add halo-sbatch rule
Add general utility programs
Merge branch 'master' into feature/slurmbatch
Add halo label to merge input suffix and to sample target name so as to override recipes in included Makefiles
Change sbatch output filename to .sbatch.sh. Add SLURM variables to example makefile.
Remove halo labels as using make version >= 3.82 solves issue of using wrong recipe
Final fixes to halo pipeline.
Merge branch 'feature/slurmbatch' into develop