Merge branch 'es/chainlint'

Revamp chainlint script for our tests. * es/chainlint: chainlint: colorize problem annotations and test delimiters t: retire unused chainlint.sed t/Makefile: teach `make test` and `make prove` to run chainlint.pl test-lib: replace chainlint.sed with chainlint.pl test-lib: retire "lint harder" optimization hack t/chainlint: add more chainlint.pl self-tests chainlint.pl: allow `|| echo` to signal failure upstream of a pipe chainlint.pl: complain about loops lacking explicit failure handling chainlint.pl: don't flag broken &&-chain if failure indicated explicitly chainlint.pl: don't flag broken &&-chain if `$?` handled explicitly chainlint.pl: don't require `&` background command to end with `&&` t/Makefile: apply chainlint.pl to existing self-tests chainlint.pl: don't require `return|exit|continue` to end with `&&` chainlint.pl: validate test scripts in parallel chainlint.pl: add parser to identify test definitions chainlint.pl: add parser to validate tests chainlint.pl: add POSIX shell parser chainlint.pl: add POSIX shell lexical analyzer t: add skeleton chainlint.pl