prog_models and prog_algs replaced by ProgPy package

[teubert]

Hello prog_models users,

Announcing the new combined ProgPy package. This package combines the previous prog_models and prog_algs packages into a single package, progpy. All new feature releases and bug fixes will happen in progpy, so please upgrade to this package to stay up to date.

To upgrade to progpy, you will need to download the new progpy package (pip install progpy) and update all imports to use progpy. For example from prog_models import PrognosticsModel becomes from progpy import PrognosticsModel, and from prog_algs import predictors becomes from progpy import predictors.

More details can be found at https://nasa.github.io/progpy