[poppler] [RFC] Add option to keep alpha channel to Qt frontends

[William Bader]

> Also the last commit makes me a bit scared to be honest, is very easy to make 
> a mistake in one of those things, I'll put it in my todo but as you know it's 
> long, would appreciate if someone else reviewed/regtested it.
Do the changes affect pdftops or pdftoppm (so that I could see what happens with my test files) or do they affect only Qt interfaces?
William
 		 	   		  
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