Enhance Seek and Scan to support multiple select drops

[gyoung]

You can do it in either order, but yes you do need to drop each individually. The drives container does not support multiple select at this time.

You may be able to avoid the need to do the drops every time by saving a state with the drops already done.

The Seek and Scan selection dialog needs some work for on the volume selection buttons, so I'll see what can be done about adding a directories only selection.

[gyoung]

C-->X inclusive [because I have variously different combinations of volumes visible, not necessarily with their preferred volume letter] that I have to drop every volume into a collector first, then set the filter? (actual problem)