Fix for fill latent zeros/noise in masking mode

fix lack of left padding for grids with 1 row

added save button
--always-batch-cond-uncond as a workaround for performance regression option for low memory users
specify gradio version as 3.1.5 because of what looks like a bug

support for --medvram
attempt to support share

experimental support for negative prompts (without UI)
option to do inpainting at full resolution
Tooltips for UI elements