[mythtv] Sound and Volume support patch

[Ken VanDine]

I have made a few changes to the patch Robert Kulagowski posted for volume 
control support in MythTV.  I love the abilty to adjust the volume and just 
wanted to tweak it.  I changed it to go up and down 2% at a time, I found this 
gave me the control I needed.  I also added a slider type OSD for volume.  I 
am not a big C++ coder and certainly don't know alot about the Myth source, so 
please let me know if I did something bad... I can take it.   
 
I would also really like to have this or something like this added to the CVS 
tree.  I think there is enough interest to add this feature. 
 
I am including the patch, it is against CVS as of Feb. 17.  This is the 
complete patch, including the work by Robert. 
 
Thanks, 
--Ken