Added option to automatically rotate patches in a nonuniform list such that height is always greater than or equal to width; this is a big data reduction for collections of elongated patches

PatchStack remembers crop boundaries of individual patches if created from list of non-matching patches

Corrected error with overlapping bounding boxes, whereby a second box would overwrite a first; instead, masks are now just additive; also catch case when trying to draw contours from a mask that is a single pixel across

Serialize after running other exports, as patch path is embedded in dataframe; write this with subdirectory

Exporting patch masks does not automatically make a PatchStack, which forces them to all be the same size

By default, return non-expanded patches and masks; allow contour and mask overlays in non-expanded patches

Standardize patch (mask) getters return ad-hoc DataFrames, and _acc methods wrap these in PatchStack accessors (which automatically become shape of largest patch)