Enhancements:
-------------

* interpret ~= in pypi skeletons, map to compatible expressions  #2427
* add arm and ppc architectures to conda convert  #2472, #2474
* add indentation to index.json and hash_input.json for easier reading  #2476
* check arch in index.json for platforms other than linux, mac, win  #2478
* update cran skeletonizer for new compilers, add flags for updating, rather than replacing recipe.  #2481

Bug fixes:
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* fix implicit pinning not taking effect in outputs, fix incorrect matching of hashed subpackages #2455
* exclude python from build requirements for purposes of hash computation.  This was causing recipes that used python as a build tool to build too many similar packages.  #2455
* Support GIT_* vars even when source folders are specified  #2477
* silence warnings about ``.*`` being added to vc deps  #2483
* fix non-finalized recipe being used for creating build env, resulting in too few variants in output  #2485