Hook the model loader into the SD_models file.
Add default url/download if checkpoint is not found.
Add matching stablediffusion-models-path argument.
Add message that --ckpt-dir will be removed in the future, but have it pipe to stablediffusion-models-path for now.
Update help strings for models-path args so they're more or less uniform.
Move sd_model "setup" call to webUI with the others.
Ensure "cleanup_models" method moves existing models to the new locations, including SD, and that we aren't deleting folders that still have stuff in them.

added console outputs, more clear indication of progress, and ability to specify full filename to checkpoint merger
restore "Loading..." text

Add support for checkpoint merging

adds support for a notification.mp3 in the root directory that will play upon completion (fixes #1013)

ddim_eta & ddim_discretize

refactored image paste handling to fill unset images successively, then replace last existing image (fixes #981)

Fixed grids saving to subdirectory when the setting is unchecked but "save images to subdirectory" was checked.

Fix by @MrAcademy

adds support for a notification.mp3 in the root directory that will play upon completion (fixes #1013)

copy over fields when sending to img2img: https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/1029