Merge branch 'ep/shell-command-substitution'

* ep/shell-command-substitution: t9362-mw-to-git-utf8.sh: use the $( ... ) construct for command substitution t9360-mw-to-git-clone.sh: use the $( ... ) construct for command substitution git-tag.sh: use the $( ... ) construct for command substitution git-revert.sh: use the $( ... ) construct for command substitution git-resolve.sh: use the $( ... ) construct for command substitution git-repack.sh: use the $( ... ) construct for command substitution git-merge.sh: use the $( ... ) construct for command substitution git-ls-remote.sh: use the $( ... ) construct for command substitution git-fetch.sh: use the $( ... ) construct for command substitution git-commit.sh: use the $( ... ) construct for command substitution git-clone.sh: use the $( ... ) construct for command substitution git-checkout.sh: use the $( ... ) construct for command substitution install-webdoc.sh: use the $( ... ) construct for command substitution howto-index.sh: use the $( ... ) construct for command substitution