INITSPEED should be tied to the snake speed

misc_utils.calc_speed should use INITSPEED as the starting point for
it's calculation.
Clean up a few window refreshes that aren't needed
Remove uneeded time module
Change line lengths to be less then 80

It's good practice to keep line lengths below 80, as then people with older
displays, or people who don't want to have to resize there terminal window,
can see all of the line.