Serialize after running other exports, as patch path is embedded in dataframe;...

See merge request !24

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

Changed name of path mask path column

See merge request !23

Use relative patch paths

See merge request !22

Key error running exports

See merge request !21

Removed pixel probabilities option from RoiSet exports

See merge request !20

Completed (de)serialization of RoiSet

See merge request !18

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)

Broadcasting is work except in some cases that appear to coincide with truncation of ROI in patch bounds