3.10.0

Enhancements:

• Warn user about path conflicts during environment building for test phase #2843
• Add conda 4.6 compatibility #2844
• remove conda 4.2 and earlier compatibility #2845
• add info to merge/copy source subdir error #2858
• Add setup for Air Speed Velocity benchmarking #2859

Bug fixes:

• fix python handling when python is a tuple (inner python looping) #2854
• fix python not looping in inner packages when top-level doesn't use it. Fix zip_keys handling. #2856

Contributors:

• @kalefranz
• @msarahan