dev: Docs
dev: Reformat to narrower width
introduce-tests: Basic test file
introduce-tests: Test data files
introduce-tests: Happy path test, failing
introduce-tests: Optional variable-name arg to lr-extract-variable

To enable testing
introduce-tests: PASS, comparing to after_01.pl
introduce-tests: Test point after extraction
Merge branch 'introduce-tests' into dev
introduce-tests: Test mark was set properly
introduce-tests: Extract macro with-lrt-perl-file
introduce-tests: Extract macro with-lrt-perl-file-select-string
Merge branch 'introduce-tests' into dev