mythnetvision: add flashplugin-nonfree as alternative depend…

mythnetvision currently has a hard dependency on flashplayer-mozilla
and will refuse to install if Debian's standard flashplugin-nonfree
package is already installed.

Is it possible to add flashplugin-nonfree as an alternative Flash
dependency to mythnetvision so that installation does not break if
this package is already installed.

Is there any key difference between the two packages in terms of functionality?

Cheers,
Nick