minor change.

See merge request !17

try to upload to pypi

See merge request !16

merged dmatrix branch that uses dmatrix to initialize each model.

See merge request !15

project.

test_pln_full and tests for only plnpca inside test_plnpca

sone setters properly.

all. Need to change the elbos and the poiss_reg to handle the case where
covariates is None (no covariates is given).

pytest.

another init

now.

Merging dev in main with various bug fixes and improvements

See merge request !14

give a str and a pd.DataFrame.