add fair property in stack layout 	- when fair is True, adding new window into Stacks in round-robin way
add fair property in stack layout
	- when fair is True, adding new window into Stacks in round-robin way

jdowner/qtile,kynikos/qtile,kseistrup/qtile,rxcomm/qtile,cortesi/qtile,ramnes/qtile,dequis/qtile,encukou/qtile,EndPointCorp/qtile,zordsdavini/qtile,qtile/qtile,StephenBarnes/qtile,himaaaatti/qtile,aniruddhkanojia/qtile,apinsard/qtile,EndPointCorp/qtile,flacjacket/qtile,kseistrup/qtile,flacjacket/qtile,soulchainer/qtile,kopchik/qtile,farebord/qtile,andrewyoung1991/qtile,dequis/qtile,tych0/qtile,ramnes/qtile,w1ndy/qtile,apinsard/qtile,kiniou/qtile,aniruddhkanojia/qtile,nxnfufunezn/qtile,kopchik/qtile,farebord/qtile,xplv/qtile,de-vri-es/qtile,cortesi/qtile,zordsdavini/qtile,kiniou/qtile,himaaaatti/qtile,jdowner/qtile,kynikos/qtile,tych0/qtile,StephenBarnes/qtile,soulchainer/qtile,de-vri-es/qtile,andrewyoung1991/qtile,xplv/qtile,frostidaho/qtile,frostidaho/qtile,encukou/qtile,w1ndy/qtile,nxnfufunezn/qtile,qtile/qtile,rxcomm/qtile