ravanan 0.2.0

What's new
----------
Features
--------
* Job scripts are now built all at once on a single connection to the
  Guix daemon. The job script is also now independent of the input.
  The inputs are passed in through a `WORKFLOW_INPUTS` environment
  variable. To maintain bullet-proof caching, we construct ravanan
  store paths by hashing both the script and the inputs together. Put
  together, this change massively speeds up ravanan and improves
  responsiveness.
* Spawn a Guix inferior only once to minimize setup and teardown
  costs.
* Encode ravanan store paths using base32 instead of base16.
* Intern files into a directory of their own, thus storing
  user-supplied files and intermediate files the same way.
* Copy input files into their own subdirectories to avoid filename
  collisions between input files.
* New --log-level option
* New --quiet flag to suppress all logging

Noteworthy bug fixes
--------------------
* Read manifest files relative to the path of the workflow file.
* Resolve type ambiguities in YAML inputs files.
* Tolerate only path or location in File type inputs.
* Intern, stage and canonicalize secondary files too.
* Handle references to parameter context variables in inline
  javascript expressions.
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