Made 'PoseLib', 'Pose Paste', and 'Transforms' use the active KeyingSet instead of a hardcoded one if there is an active KeyingSet and the 'Only Insert for Keying Set' option is enabled in the User Prefs.
Also, made sure that for transforms, the active KeyingSet is provided with the data being modified instead of having them retrieve this from the context (which may miss a few items).
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While making the changes for pose paste, made pasting poses not destroy the existing properties on the bones if the buffer bones didn't have any properties to replace the old ones with. IMO, this seems a bit too destructive if they don't get replaced, but perhaps in some cases not removing causes some problems with bad poses?
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