Blink cursor changes, possible W32 breakage.

[Jan Djärv]

Hello.

Just a heads up, I changed blink cursor in two ways, one is that it stops 
blinking after blinking
blink-cursor-blinks number of times (10 by default), as inspired by 
gnome-terminal.  Also, timers are stopped when no blinking occurs.

This works on NS and X but not on W32.  I tried to be careful to not break W32, 
but it might happen anyway.  If anybody wants to implement this for W32, you 
basically need to implement generating a FOCUS_OUT_EVENT, like xterm,c and 
nsterm.m does and adjust those places in keyboard.c and frame.el that checks 
for X and NS only.

        Jan D.