hg.exe doesn't see any of the default config files on py3
This is related to the py3 beta installer. I had to launch thg.exe on the command line with
--config ui.username=test to work around #5775 (closed).
hg config --pager=never has no output in the terminal, but does have some in the log window. It's still not everything, and
hg config -e wants to open
vi by default.