benchmarks/progs/tree234/tree234x.m:
benchmarks/progs/pic/mercury/utils.m:
Replace uses of is a synonym for unification.
benchmarks/progs/training_cars/*.m:
Delete implementation imports that shadow those in the interface.
This file-specific setting will override a default setting of expandtabs
in $HOME/.vimrc.
*/Makefile:
*/Mmakefile:
As above.
tests/hard_coded/.gitignore:
Don't ignore the purity subdir. This ignore must have been left over
from when purity.m was a test in hard_coded, not hard_coded/purity,
and it ignored an executable, not a directory.