Cleanup in flow and mincut code; added selection-switch detection in colored corners file selection, also support for detecting dropped selections (still untested) in file list proper; moved bitmap a little in synthesis part of sample to accommodate at least slight increases in tile dimension (might just need to limit the sample to the content dimensions), apparently have colors restoring and patches overlaying, looks reasonable, given lack of stuff implemented (single patch, random placement, no feathering or multi-resolution spline touch-ups, basic inter-pixel cost function)