restore previous naming scheme for sd-2.x models: (#2820)

- stable-diffusion-2.1-base base model from
stabilityai/stable-diffusion-2-1-base

- stable-diffusion-2.1-768 768 pixel model from
stabilityai/stable-diffusion-2-1-768

- sd-inpainting-2.0 512 pixel inpainting model from
runwayml/stable-diffusion-inpainting

This PR also bumps the version number up to v2.3.1.post2

Author: lstein

invokeai/configs/INITIAL_MODELS.yaml

@@ -13,14 +13,19 @@ sd-inpainting-1.5:
   vae:
     repo_id: stabilityai/sd-vae-ft-mse
   recommended: True
-stable-diffusion-2.1:
+stable-diffusion-2.1-768:
    description: Stable Diffusion version 2.1 diffusers model, trained on 768 pixel images (5.21 GB)
    repo_id: stabilityai/stable-diffusion-2-1
    format: diffusers
    recommended: True
+stable-diffusion-2.1-base:
+   description: Stable Diffusion version 2.1 diffusers model, trained on 512 pixel images (5.21 GB)
+   repo_id: stabilityai/stable-diffusion-2-1-base
+   format: diffusers
+   recommended: False
 sd-inpainting-2.0:
    description: Stable Diffusion version 2.0 inpainting model (5.21 GB)
-   repo_id: stabilityai/stable-diffusion-2-1
+   repo_id: stabilityai/stable-diffusion-2-inpainting
    format: diffusers
    recommended: False
 analog-diffusion-1.0:

ldm/invoke/_version.py

@@ -1 +1 @@
-__version__='2.3.1.post1'
+__version__='2.3.1.post2'