Conda

* fix 2846 revert the use of UNC paths; shorten trash filenames, 2859
* fix exp backoff on Windows, 2860
* fix 2845 URL for local file repos, 2862
* fix 2764 restore full path var on win; create to CONDA_PREFIX env var, 2848
* fix 2754 improve listing pip installed packages, 2873
* change root prefix detection to avoid clobbering root activate scripts, 2880
* address 2841 add lowest and highest priority indication to channel config output, 2875
* add SYMLINK_CONDA to planned instructions, 2861
* use CONDA_PREFIX, not CONDA_DEFAULT_ENV for activate.d, 2856
* call scripts with redirect on win; more error checking to activate, 2852

* ensure conda-env auto update, along with conda, 2772
* make yaml booleans behave how everyone expects them to, 2784
* use accept-encoding for repodata; prefer repodata.json to repodata.json.bz2, 2821
* additional integration and regression tests, 2757, 2774, 2787
* add offline mode to printed info; use offline flag when grabbing channels, 2813
* show conda-env version in conda info, 2819
* adjust channel priority superseded list, 2820
* support epoch ! characters in command line specs, 2832
* accept old default names and new ones when canonicalizing channel URLs 2839
* push PATH, PS1 manipulation into shell scripts, 2796
* fix 2765 broken source activate without arguments, 2806
* fix standalone execution of install.py, 2756
* fix 2810 activating conda environment broken with git bash on Windows, 2795
* fix 2805, 2781 handle both file-based channels and explicit file-based URLs, 2812
* fix 2746 conda create --clone of root, 2838
* fix 2668, 2699 shell recursion with activate 2831

* improve messaging for "downgrades" due to channel priority, 2718
* support conda config channel append/prepend, handle duplicates, 2730
* remove --shortcuts option to internal CLI code, 2723
* fix an issue concerning space characters in paths in activate.bat, 2740
* fix 2732 restore yes/no/on/off for booleans on the command line, 2734
* fix 2642 tarball install on Windows, 2729
* fix 2687, 2697 WindowsError when creating environments on Windows, 2717
* fix 2710 link instruction in conda create causes TypeError, 2715
* revert 2514, 2695, disabling of .netrc files, 2736
* revert 2281 printing progress bar to terminal, 2707

* add auto_update_conda config parameter, 2686
* fix 2669 conda config --add channels can leave out defaults, 2670
* fix 2703 ignore activate symlink error if links already exist, 2705
* fix 2693 install duplicate packages with older version of Anaconda, 2701
* fix 2677 respect HTTP_PROXY, 2695
* fix 2680 broken fish integration, 2685, 2694
* fix an issue with conda never exiting, 2689
* fix 2688 explicit file installs, 2708
* fix 2700 conda list UnicodeDecodeError, 2706

* clean up activate and deactivate scripts, moving back to conda repo, 1727,
2265, 2291, 2473, 2501, 2484
* replace pyyaml with ruamel_yaml, 2283, 2321
* better handling of channel collisions, 2323, 2369 2402, 2428
* improve listing of pip packages with conda list, 2275
* re-license progressbar under BSD 3-clause, 2334
* reduce the amount of extraneous info in hints, 2261
* add --shortcuts option to install shortcuts on windows, 2623
* skip binary replacement on windows, 2630
* don't show channel urls by default in conda list, 2282
* package resolution and solver tweaks, 2443, 2475, 2480
* improved version & build matching, 2442, 2488
* print progress to the terminal rather than stdout, 2281
* verify version specs given on command line are valid, 2246
* fix for try_write function in case of odd permissions, 2301
* fix a conda search --spec error, 2343
* update User-Agent for conda connections, 2347
* remove some dead code paths, 2338, 2374
* fixes a thread safety issue with http requests, 2377, 2383
* manage BeeGFS hard-links non-POSIX configuration, 2355
* prevent version downgrades during removes, 2394
* fix conda info --json, 2445
* truncate shebangs over 127 characters using /usr/bin/env, 2479
* extract packages to a temporary directory then rename, 2425, 2483
* fix help in install, 2460
* fix re-install bug when sha1 differs, 2507
* fix a bug with file deletion, 2499
* disable .netrc files, 2514
* dont fetch index on remove --all, 2553
* allow track_features to be a string *or* a list in .condarc, 2541
* fix 2415 infinite recursion in invalid_chains, 2566
* allow channel_alias to be different than binstar, 2564

* allow auto_update_conda from sysrc, 3015 via 3021