Media and dialogs

[Leon Pennington]

Hi, 

Added new keywords to Media, "aa_level", "aa_threshold" and "method". Decided 
to do them alphabetically :)

I've also altered slightly the way Media worked, basically removed flags for 
enabling values, and used the default values to check whether things have 
been altered. I've done this for consistancy.

What I want to know is, was that the right thing to do?

Ways of doing things change over time. So I took the last object added ( iso 
surface ) as my refrence for how things should be done, and as I make my way 
through the other objects I'd planned to try and make the object properties 
dialog consistant.

-- 
Leon Pennington

"Programming, it's an art form that fights back."