Everything looks so beautiful and unified! :3

• colorama usage simplified colouring code
• prettytable allowed to get rid of all that "{0:>14} ...".format() magic.
• .__repr__()'s code of irqtop/link-rate just asking to be used in network-top without any changes

By the time, there is two new utils: maskify and subnet2iplist:

maskify: a46a0c4
subnet2iplist: 1c87bbe (really c53e505)