01-sanity milestone

Tests in 01-sanity/ are "threshold" to running other tests in suite

Unfortunately, Pugs' Test.pm evolved beyond features in 01-sanity/

• multi-arg pointy subs
• optional and named argument passing
• other items

Plan:

• Build a simple Test.pm that only requires 01-sanity/ features
• Allows development to take place on other components
• Converge on larger Test.pm
• Design sanity suites and test harnesses to be used at increasing levels of compiler complexity