Fix error when using img2img batch without masks

fixed a bug where after switching to a checkpoint with unknown hash, you'd get empty space instead of checkpoint name in UI
fixed a bug where if you update a selected checkpoint on disk and then restart the program, a different checkpoint loads, but the name is shown for the the old one.

Ask user to clarify conditions

Allow users to convert models to Instruct-pix2pix models by supporting merging Instruct-pix2pix models with regular ones in the merge tab

don't replace regular --help with new paths.py parser help

Add a Python version check

Add flag to store user data sepperate from source code

Add button to switch width and height

Allows for multiple Styles axii in X/Y/Z Plot

add v2-inpainting model detection, and broaden v-model detection to include anything with 768 in the name

Basic inpainting batch support

Modifies batch UI to add optional inpainting support

add v2-inpainting model detection, and broaden v-model detection to include anything with 768 in the name

Adds a button to switch width and height, allowing quick and easy switching between landscape and portrait.

previously module attributes like __file__ where not set correctly,
leading to scripts getting the directory of the stable-diffusion repo
location instead of their own script.

This causes problem when loading user data from an external location
using the --data-dir flag, as extensions would look for their own code
in the stable-diffusion repo location instead of the data dir location.

Using pythons importlib functions sets the modules specs correctly and
executes them. But this will break extensions if they build paths based
on the previously incorrect __file__ attribute.

fix broken api for checkpoint list

fix some style inconsistenices

Changed filename addition from "instrpix2pix" to the more readable ".instruct-pix2pix" for newly generated instruct pix2pix models.

Fix full previews and--no-half-vae to work correctly with --upcast-sampling