Bug fixes:
----------

* Don't symlink conda when building conda (clobbers actual scripts)  #2167
* Fix pyldd following links  #2170
* Preserve mode bit on noarch python bin/Scripts files  #2171
* remove logging output showing up with --output option #2174
* Fix CONDA_* variables without .  #2176
* pass croot to extraction (file path length issue on win)  #2178
* fix uncorrect unpacking of tuples with --skip-existing  #2179
* Fix priority of setup.cfg over setup.py  #2180
* Remove overly aggressive removal of test prefix at end of test phase  #2182
* Fix upper bound increment to account for pre-release versions (alpha, beta, rc, etc.)  #2183