[Companion] Button sizes

[Brian]

I found out that simple buttons (like the magnifier toggle) on the 
toolbar were taller than menus and menu-buttons, so that was making a 
difference.

I was running a slightly newer version than the current alpha, so I 
didn't see the effect.  After installing the alpha build, the toolbar 
was 32px high, rather than the 27px I was getting with my build.

Anyway, you can reduce that by changing the first entry in 
yahootoolbar.css to:

    toolbarbutton.yahoobuttonmenu,
    #yahootoolbar_dyn toolbarbutton
    {
        margin: 0px 0px 0px 0px;
    }

The same effect can be achieved more efficiently by changing 
class_CompanionDisplayer.js to assign a class to the buttons and using 
that in the CSS.  I am sending that version to Dave.