Change size of master/stack

[codic12]

Right now in tiling mode it's 50/50 (with gaps the master window is $GAPS bigger, which you shouldn't notice unless you have huge gaps).

A common alternative seems to be, eg 60/40. i think that this should be configurable at runtime with commands to increment and decrement the %.

[godalming123]

agreed

[godalming123]

this would be a cool feature to see