Enhancements:
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* add the "extra" field of a package's meta.yaml file into the output package's info/about.json file  #3048
* add option to omit local channel in is_package_build (used by c3i)  #3051
* add pip env vars to prevent it from pulling in external dependencies when used in build scripts  #3053

Bug fixes:
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* fix local channel always being top priority.  Allow user-defined channel orders where local is lower than remotes.  #3049
* Fix conda-verify import error warning showing up in --output text  #3052
* fix RPM skeleton test (point to newer CentOS repo) #3054
* fix test/files and test/source_files looking in the wrong place for info/recipe/parent contents (subpackages)  #3061

Contributors:
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* @Bezier89
* @jakirkham
* @mikecormier
* @mingwandroid
* @msarahan