Change "git reset" default to --mixed (#3264)

Calling "git reset" on the command line (without further arguments)
defaults to --mixed, which is reason enough to make it the default for
us, too.

But I also find myself using --mixed more often than --soft. The main
use case for me is that I made a bunch of WIP commits, and want to turn
them into real commits when I'm done hacking. I select the last commit
before the WIP commits and reset to it, leaving all changes of all those
commits in the working directory. Since I want to start staging things
from there, I prefer those modifications to be unstaged at that point,
which is what --mixed does.

0 files changed, 0 insertions, 0 deletions