Actually thinking about this a bit more I think I have the solution to
the font size madness:

- We do not want fixed physical sizes, as explained above

- We do not want fixed pixel sizes either - what happens if you have two
monitors of the same size and different resolution? You want greater
detail, not smaller fonts.

- What we want is the physical font size to be a *fixed fraction of the
screen size*. That makes small screens have smaller fonts, large screens
have larger fonts, and same-size screens of different resolutions (or
even the same screen at different resolutions) have the same font sizes.

I.e., we want:

FONT_SIZE_IN_PT = FACTOR_X * (RESOLUTION_X / DPI_X) / 72

or if we want to use the vertical screen size for reference

FONT_SIZE_IN_PT = FACTOR_Y * (RESOLUTION_Y / DPI_Y) / 72

Doing the maths for my monitor, and assuming that the font sizes I like
are optimal, FACTOR_X = 1/96 and FACTOR_Y = 1/77.

NB, if I am not mistaken, the font size refers to the vertical size of
the characters. However there is no problem in defining it using the
horizontal screen size - in fact I would recommend that option to deal
with wide-screen aspect ratios consistently.

NB2, it would be a good idea to lower-limit the default font size in
pixels, to make sure it can be rendered. Think mobile-phone sized
displays.

-- 
Change to 13.333px is a regression for me - fonts far too large
https://bugs.launchpad.net/bugs/345189
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