Registry directory ignore on harvest all

[bloomonkey]

First reported by @sdm7g in #27

Also note that when using a directory setting in the registry, and doing a harvest "all" , all of the files from all providers go into the directory from the first provider chosen. Not sure that anything can be done about that other than documenting that is the case, or perhaps it would be less confusing just to take directory out of the registry. Since the directory setting is per invocation rather than per provider, it would make more sense to restrict it to the command line and not have registry values that are ignored.