Allow the Flag-Raising Folder to be set for a RaiseFlag Activity

[#1]

At present, when a flag is raised, the current Folder is set as the Flag Raiser (leaving the default as the current Folder). If we could set the Flag Raise, we could do a lot more.

As an example, when I want to raise a flag to move a dozen or so Folders from a Stage where there are a few thousand, I need to raise the flag as the FolderId of the folder(s) I want to move, and set the Flag action to respond to 'this folder'. Almost any other way is very sub-optimal, and can actually cause a huge performance impact (we've seen many instances where this mistake has been made).

Adding this feature would, for example, allow me to have a for-each activity, pass in a Business Object with the list of Folder Ids, and raise the flag for each one using the 'correct' Activity ratrher than the somewhat less useful 'generic' RaiseFlag activity as we must do now.