Merge branch 'js/transport-helper-error-reporting-fix' into fc/makefile

* js/transport-helper-error-reporting-fix: git-remote-testgit: build it to run under $SHELL_PATH git-remote-testgit: further remove some bashisms git-remote-testgit: avoid process substitution t5801: "VAR=VAL shell_func args" is forbidden transport-helper: update remote helper namespace transport-helper: trivial code shuffle transport-helper: warn when refspec is not used transport-helper: clarify pushing without refspecs transport-helper: update refspec documentation transport-helper: clarify *:* refspec transport-helper: improve push messages transport-helper: mention helper name when it dies transport-helper: report errors properly Conflicts: t/t5801-remote-helpers.sh