Linux fixup for BlankState

Nothing major, just setting no focus on buttons since
it gives them a salmon pink color, which is pretty nasty
on the 'img' button.

Did I mention that I love this new feature?
UI Nits: Choose Athlete Dialog Buttons

.. order of New, Cancel, Open and a bit of stretch
to stop ugly elongated buttons.
UI Nits: Cosmetic gui updates

- searchbox border
- LTM controls - make search box expand
- Histogram controls - make slider expand
UI Nits: Sensible defaults for screen/font size

Set the default size of fonts and screens based upon the
screen size we're running on.

We may need to think about retrospectively adjusting the
font size for users that have not realised they can change
from the defaults (which may not be valid for their hardware).