Alpha 0.02

Release notes:

alpha-0.02

• Synchronous program invocation for top level expressions
• Function literals with arg type hinting (::), but without type inference
• Zip operator, |:
• :ast, :type and :mem-stats built-in commands
• fst and snd built-in functions
• If they do not contain segments, filenames are first searched for in the $PATH
• Root spelled -, e.g. -/bin/cat
• Lists can be passed to classic Unix programs
• Proper list literal analysis, considering all elements and typing [] as 'a => ['a]
• Improvements relating to type unification and quantification
• let shadows previous declarations
• Many more improvements under the hood