* black reformat
* tighten up error reporting
* lint
* fine tuning
* additional improvements in exception handling
* lint
* include exception and traceback in log
* fix typo
* first cut at re-embedding route and back-end support
* update and expand config route tests
* add scanpy_umap
* add reembedding to config route parameters
* front-end support for reembedding fetch and UI
* remove unused imports
* add loading state
* save reembedding in reducer state
* improve withColsFrom
* transmit reembed schema to client; pick unique embedding names
* display embeddings
* format
* lint
* spaces, tab size 2
* lint
* test hack for smoke-test race
* back out hack sleep
* add check for backed mode
* add unit test for reembedding
* lint
* hide re-embedding CLI param from help
