Tweak the default window layout since rendering changes and constraining window sizes...

Tweak the default window layout since rendering changes and constraining window sizes to be a multiple o fthe tile size cause overlap with the old layout (at least on an early 2015 13" MacBook Pro; native resolution is 2560 x 1600; using the English interface).  Set the sizes so they should work without overlap using the default fonts (Menlo/Hiragino Maru Gothic 13 pt for the main window; 10 pt for the rest) on the smallest native resolution for currently supported Retina Macs (MacBook; 2304 x 1440).