Add bats-support, needed for bats-assert.

.gitmodules

 [submodule "tests/bats_helpers/bats-assert"]
 	path = tests/bats_helpers/bats-assert
 	url = https://github.com/bats-core/bats-assert.git
+[submodule "tests/bats_helpers/bats-support"]
+	path = tests/bats_helpers/bats-support
+	url = https://github.com/bats-core/bats-support.git

bats-support @ d140a650

+Subproject commit d140a65044b2d6810381935ae7f0c94c7023c8c3

tests/test_mnpw.bats

 # vim:ft=bash
 
 setup () {
+    load "bats_helpers/bats-support/load"
     load "bats_helpers/bats-assert/load"
     PATH="$BATS_TEST_DIRNAME/../dist:$PATH"
 }