Merge branch 'maint' * maint: tests: avoid one last `...` command substitution in 'test-init.sh' maintcheck: guard against `...` for command substitution in test cases tests: more uses of $(...) over `...` for command substitution cosmetics: quote `like this', not 'like this', in a couple of tests readme: clarify/extend few entries in 't/README' readme: better separation of entries in 't/README' readme: subsections "Do" and "Do not" in 't/README' merged tests: new requirement 'grep-nonprint' cosmetics: fix description of an expected error message in a test tests: assume automake quotes 'like this', not `like this' Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>