Enhancements:
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* Inspect linkages will now warn when multiple packages contain the same library  #1884, #1921

Bug fixes:
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* Fix bin/conda getting included in packages that also had entry point scripts or binaries starting with 'conda'  #1923
* Fix empty create_env, for compatibility with conda 4.4  #1924
* Adapt to Conda's new MatchSpec implementation  #1927
* Fix unbound local variables when --no-locking option used.  #1928
* Don't set language env vars (PERL, R, LUA, etc.) when packages for those languages are not installed  #1930