[Pkg-graphite-maint] Dependency on graphite-carbon; lack of depend on python-whisper

[Dave Rawks]

	I see that your control file includes graphite-carbon as a dependency, 
which it shouldn't as it is possible to use graphite-web on a separate 
box from where your carbon-cache instance is run. However I think that 
graphite-web does depend on python-whisper's whisper module. I've no 
idea how to propose a change or whether this should include an attached 
diff or something, but I presume the simplicity of the change makes it 
trivially obvious to make should maintainers agree.

Thanks in Advance
-Dave