Update-writes and improved to/from anndata X-layer selection options
What's Changed
Major UX:
* Support update-write of SOMAs by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/249
* Allow from_anndata to select X layer by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/245
* Keystroke-saver method for add-X-layer by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/246
* Fix NaN issue on SOMA-slice concat by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/248
Minor UX:
* Depend on latest TileDB-Py, with core 2.11 by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/237
* Set dataframe indices correctly on readback, if from R by johnkerl in https://github.com/single-cell-data/TileDB-SingleCell/pull/247
Docs and copyright:
* Add SOMA spec by aaronwolen in https://github.com/single-cell-data/TileDB-SingleCell/pull/252
* Add copyright notice to all C++ files by Shelnutt2 in https://github.com/single-cell-data/TileDB-SingleCell/pull/251
Internals:
* Improvements to the C++ acceleration library by gspowley in https://github.com/single-cell-data/TileDB-SingleCell/pull/235
* Support fmt that is system installed with spdlog by Shelnutt2 in https://github.com/single-cell-data/TileDB-SingleCell/pull/250
**Full Changelog**: https://github.com/single-cell-data/TileDB-SingleCell/compare/0.1.6...0.1.7