Stitch2d

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Added

- Added `prep_imdata()` to Tile and Tile subclasses. This method can
be used to prepare image data before feature detection and matching,
for example, by converting a 16-bit image to an 8-bit image.

Changed

- Fixed bug stitching mosaics that have not been aligned and that have
inconsistent row heights or column widths. The tiles making up each
row must still have the same height, and those making up each column
must have the same width.
- The `Mosaic.align()` method now raises RuntimeError if it fails to
detect any features or align at least two tiles.

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Added

- Added optional channel_order kwarg to the stitch method. Allows
users to specify the channel order in the stitched array.

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Added

- Added scikit-image backend in addition to opencv (but it’s very
slow)
- Added tests

Changed

- **Breaking:** Refactored package and discarded or modified all
functions and classes
- Modified functions to make it easier to customize the stitching
workflow
- Can now create a mosaic from a grid with unknown structure

Removed

- Removed subcommands from command line tool. Use the stitch2d command
directly to create mosaics instead.
- Removed ability to set offsets manually using a GUI. Use the limit
kwarg on the align method and the build_out method to quickly build
mosaics instead.
- Removed example tiles
- Removed modules used to organize tiles generated in the NMNH Mineral
Sciences labs