Conda

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* fix: removed reference to win_ignore_root in plan module

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* allow Python to be updated in root environment on Windows, 1657
* add defaults to specs after getting pinned specs (allows to pin a
different version of Python than what is installed)
* show what older versions are in the solutions in the resolve debug log
* fix some issues with Python 3.5
* respect --no-deps when installing from .tar or .tar.bz2
* avoid infinite recursion with NoPackagesFound and conda update --all --file
* fix conda update --file
* toposort: Added special case to remove 'pip' dependency from 'python'
* show dotlog messages during hint generation with --debug
* disable the max_only heuristic during hint generation
* new version comparison algorithm, which consistently compares any version
string, and better handles version strings using things like alpha, beta,
rc, post, and dev. This should remove any inconsistent version comparison
that would lead to conda installing an incorrect version.
* use the trash in rm_rf, meaning more things will get the benefit of the
trash system on Windows
* add the ability to pass the --file argument multiple times
* add conda upgrade alias for conda update
* add update_dependencies condarc option and --update-deps/--no-update-deps
command line flags
* allow specs with conda update --all
* add --show-channel-urls and --no-show-channel-urls command line options
* add always_copy condarc option
* conda clean properly handles multiple envs directories. This breaks
backwards compatibility with some of the --json output. Some of the old
--json keys are kept for backwards compatibility.

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* add windows_forward_slashes option to walk_prefix(), see 1513
* add ability to set CONDA_FORCE_32BIT environment variable, it should
should only be used when running conda-build, 1555
* add config option to makes the python dependency on pip optional, 1577
* fix an UnboundLocalError
* print note about pinned specs in no packages found error
* allow wildcards in AND-connected version specs
* print pinned specs to the debug log
* fix conda create --clone with create_default_packages
* give a better error when a proxy isn't found for a given scheme
* enable running 'conda run' in offline mode
* fix issue where hardlinked cache contents were being overwritten
* correctly skip packages whose dependencies can't be found with conda
update --all
* use clearer terminology in -m help text.
* use splitlines to break up multiple lines throughout the codebase
* fix AttributeError with SSLError

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* rename binstar -> anaconda, see 1458
* fix --use-local when the conda-bld directory doesn't exist
* fixed --offline option when using "conda create --clone", see 1487
* don't mask recursion depth errors
* add conda search --reverse-dependency
* check whether hardlinking is available before linking when
using "python install.py --link" directly, see 1490
* don't exit nonzero when installing a package with no dependencies
* check which features are installed in an environment via track_features,
not features
* set the verify flag directly on CondaSession (fixes conda skeleton not
respecting the ssl_verify option)

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* fix conda with older versions of argcomplete
* restore the --force-pscheck option as a no-op for backwards
compatibility

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* sort the output of conda info package correctly
* enable tab completion of conda command extensions using
argcomplete. Command extensions that import conda should use
conda.cli.conda_argparse.ArgumentParser instead of
argparse.ArgumentParser. Otherwise, they should enable argcomplete
completion manually.
* allow psutil and pycosat to be updated in the root environment on Windows
* remove all mentions of pscheck. The --force-pscheck flag has been removed.
* added support for S3 channels
* fix color issues from pip in conda list on Windows
* add support for other machine types on Linux, in particular ppc64le
* add non_x86_linux_machines set to config module
* allow ssl_verify to accept strings in addition to boolean values in condarc
* enable --set to work with both boolean and string values