Kwcoco

Added
* Can now ask for the resolution of an asset in CocoImage.


Changed
* Renamed `CocoImage.delay` to `CocoImage.imdelay`. The old name will be available as an alias, but will eventually be deprecated.
* Import time is now much faster.
* default `check_aux` to True in `CocoDataset.missing_images`

Added
* Experimental support for reading / writing kwcoco files to / from zipfiles.

Changed
* Improved splitting in kwcoco split CLI. Better handling for video datasets. Category balance is now optional.

Fixed
* Bug where specifying resolution to `delay` would not work if the channels did not exist.

Added
* Add `role` property for annotations in the schema.

Fixed
* Added `instance_id` for mmlab tracking
* Fixed np.bool
* Fixed np.float

Added

* Initial support to conform to mmlab coco specs
* Added ability to specify resolution in `CocoImage.delay`
* Add resolution to the image / video schema.


Fixed
* kwcoco validate now reports errors for all inputs


Changed

* Modified signatures of `annots` and `images` to use `annot_id` and `image_id`
instead of `aid` and `gid`.

* Removed mentions of "flicks" in timestamps. We are simply using ISO strings
and unix times for now.

* Updated timestamp details in the SPEC.

* Updated descriptions and organization in the formal schema.

* Require that names do not contain the "/" character in the formal schema.

Added
* Initial support for PostgreSQL
* In CocoDataset.coerce the arg `sqlview` can now be given as a string `sqlite` or `postgresql`.


Fixed
* Lookup on SQL database now handles json columns

Fixed
* Taking non-existing channels from a single-image delayed node returns a
concatenated node with existing and nan channels.

Changed
* Taking subchannels from a concatenated delayed node now groups discontinuous
indices from the same underlying image.
* `channel_spec`, `sensorchan_spec`, `util.lazy_frame_backends`, and
`util.delayed_ops` have all been ported to the new `delayed_image` package.

Removed
* Removed old `util_delayed_ops`