[lmi] pre-wx-2.9.5 appearance changes

[Greg Chicares]

Compared to the wx-2.9.3 release, on msw xp sp3 (with an
unusual graphics card and an unusual screen resolution),
I notice two changes in the appearance of lmi's toolbar:

(1) Improvement: buttons are now vertically centered. With
2.9.3, they were top-aligned. (Maybe I could have accomplished
the same thing with 2.9.3 by using some flag, but it's nice
that the default behavior is more attractive.)

(2) Regression: grayed buttons are less attractive with the
new build. Formerly, they looked like gray-scale equivalents
of the full-color buttons; now, they seem to use only two
shades of gray. One particularly noticeable example is
lmi's 'save.png', which is derived from 'stock_save.png'
in the 24x24 gnome-icon-theme icon set. I'll send a small
screen capture privately.

Menus look exactly the same to me.

Tabbed dialogs look almost the same. The newer version aligns
groupbox (box sizer) labels more attractively, centering them
better with the border. Another improvement is that a slight
amount of space (maybe three pixels) has been added at the
left margin of many textcontrols, making their contents a
little easier to read.