Clean separation of Apt and batch file messages

[maphew]

As explored in #40, the intermingling of Apt progress reporting and the messages coming from batch files extracted from packages can make it difficult to determine where a problem is coming from. It would be good to portray these messages and errors in way that makes it easier to differentiate.

One idea is to redirect batch stdout stderr to another console or log file(s). The more I think about this though the less attracted I am. Who wants to wade through possibly dozens or hundreds of logfiles in the event of an issue? Maybe could just draw them in different colours?

Anyway, no solution or plan for one at this point, just a ticket to attach one to later.