Changes:
* Remove pandas as implicit pd import
* Docs: Insert the list of valid timezones into docstrings
* Fix the rt_numpy.arange() signature.
* Revert "Fix the rt_numpy.arange() signature."
* Fix arange tests
* Docs: categorical validation firstpass
* Fix pandas import for docstrings
* Allow customizing table HTML output
* Docs: Remove mentions of old codenames from docs and code
* Docs: Updates parameter descriptions for rt.merge
* Don't emit partition with empty pdataset
* Make rt.arange() signature match np.arange()
* Docs : Validation fixes for rt_numpy
* Ignore existing dirs when creating SDS dirs
* Tweaks to build configs
* Enable multi-threaded hdf5 load by default with 16 threads
* Add tests for SDS stacked loading with empty files
* Docs: Fix link from Tutorial/Categoricals to Categoricals User Guide
* Fix checkaddtype for datetime scalars
* Avoid recursing into Datasets in Struct.key_search()
* pin to riptide_cpp-1.16.3
* Fix ruff setting which changed names in recent version of ruff.
* Invoke riptable.tests via pytest, not riptable.tests.run