Janet 1.22.0

• Prohibit negative size argument to table/new.
• Add module/value.
• Remove file/popen. Use os/spawn with the :pipe options instead.
• Fix bug in peg thru and to combinators.
• Fix printing issue in doc macro.
• Numerous updates to function docstrings
• Add defdyn aliases for various dynamic bindings used in core.
• Install janet.h symlink to make Janet native libraries and applications
  easier to build without jpm.