Merge branch 'es/chainlint'

The chainlint test script linter in the test suite has been updated.

* es/chainlint:
  chainlint.sed: stop splitting "(..." into separate lines "(" and "..."
  chainlint.sed: swallow comments consistently
  chainlint.sed: stop throwing away here-doc tags
  chainlint.sed: don't mistake `<< word` in string as here-doc operator
  chainlint.sed: make here-doc "<<-" operator recognition more POSIX-like
  chainlint.sed: drop subshell-closing ">" annotation
  chainlint.sed: drop unnecessary distinction between ?!AMP?! and ?!SEMI?!
  chainlint.sed: tolerate harmless ";" at end of last line in block
  chainlint.sed: improve ?!SEMI?! placement accuracy
  chainlint.sed: improve ?!AMP?! placement accuracy
  t/Makefile: optimize chainlint self-test
  t/chainlint/one-liner: avoid overly intimate chainlint.sed knowledge
  t/chainlint/*.test: generalize self-test commentary
  t/chainlint/*.test: fix invalid test cases due to mixing quote types
  t/chainlint/*.test: don't use invalid shell syntax