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* add --offline option to install, create, update and remove commands, and
also add ability to set "offline: True" in condarc file
* add conda uninstall as alias for conda remove
* add conda info --root
* add conda.pip module
* fix CONDARC pointing to non-existing file, closes issue 961
* make update -f work if the package is already up-to-date
* fix possible TypeError when printing an error message
* link packages in topologically sorted order (so that pre-link scripts can
assume that the dependencies are installed)
* add --copy flag to install
* prevent the progressbar from crashing conda when fetching in some
situations