[XForms] Shared GL contexts

[Angus Leeming]

Jason,

attached is your shared GL context patch in a form ready for inclusion 
in current XForms cvs. I've done little more than rename the files of 
the demo as
	demos/sgl.c
	demos/fd/sgl_gui.fd
	demos/fd/sgl_help.fd
	demos/fd/sgl_sub.fd

with concommittant changes to the names of the FD_ structs. I've also 
ensured that the demo will #include forms.h and glcanvas.h from the 
tree rather than any already-installed versions.

To build, I ran:
$ ./autogen.sh
$ mkdir build && cd build
$ ../configure --enable-demos
$ make

I had a play with the demo. Very pretty ;-)

Unfortuanately, I managed to shut down X11 when I exited from the 
demo. It doesn't do this everytime, but most definitely did do it 
once. I'd been playing with the main window quite a lot and had 
managed to 'turn off' the objects in the three left-most sub windows 
on the top row.  I'd popped up the sub window and read the data in 
the help menu. I can't remember whether all three windows were open 
when I hit the 'Exit' button on the main form. At that point X died.

I'll try and crash it again from within gdb, but this is just a heads 
up.

Incidentally, does anyone know how I can pipe the output from gdb to a 
file? I'm not going to get much useful info if I run gdb from an 
xterm if I'm going to end up killing X...

Angus
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