The function getOppositeColor in color_compliment.py
did not work properly. It was mixing value ranges
from 0-1 and ranges from 0-255

When hostname colorization is enabled, then a
random number is being generated for the foreground
color of the hostname and the opposite color is
being calculated for the background color.

When running in a shell with dark background color
it typically looks better if the background color
of the hostname is "bright". So I introduced an
option in the configuration named "hostname.dark"
that (when set to true) picks the brighter of the
two colors for the hostname as the background color.

The initial fix unnecessarily divided RGB values by 255