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Merge branch 'develop' of github.com:rm-hull/yalix

* 'develop' of github.com:rm-hull/yalix:
  Stupid git
  Spaces/tabs malfunction
  Edits & fix typos
  Add missing code markers
  Common environment maker
  Debug tracing and mostly working REPL printing
  Bug: variadic arg was being evaluated from extended env, NOT supplied env
  Add some quoting tests
  Represent an s-expr as a list in quoted form
  An s-expression can be an empty list
  Both nil and symbols are atoms
  Removed print
  Implemented docstring; DRY tidy-up on DefineFunction
  Update README.md
  Lazy list / delayed evaluation
  Delay & force embedded directly inside cons-cells
Variadic arithmetic operators