Add default configuration file

[milnak]

would be nice to have a configuration file to allow one to specify defaults to use when not specified from commandline.

(alternately, an environment variable)

[sharkdp]

I'd be open for adding dedicated environment variables for some settings. Which settings do you have in mind?

[BackSpace54]

Hi,
the --panels <N> setting for me, the 2 panels default is too short.
Why not set auto by default?
Tia.