* Fix serious failure to reload "imported" (i.e. all non-derived non-main) models from .sv file * Give a short playback duration to notes with formal duration of 0 or 1 * Show crosshairs on spectrogram even when there is another layer on top (if it isn't opaque) * Always paste to the same time in the layer as the cut/copy was from, rather than to the playback pointer -- less flexible, but more predictable and less annoying. We probably need a way to get the old behaviour if pasting from somewhere else in the future (e.g. from a text file), but we can't do that yet anyway * Use a compound operation for dragging and resizing selections, so as to ensure a single undo operation works * Use a note model as the target for feature extraction plugins that output variable samplerate data with more than one value per feature * Avoid possible crashes in cut/paste if a layer proves to have no model