* Add LDSR Upscaling

added command line argument --autolaunch to open the webui URL in the system's default browser upon launch (implements #274)

* handles exceptions if jpeg jfif data not present
* removes further non-comment related exif data.

Allows you to pass in Gradio authentication like:
`--auth username:password`
Supports multiple sets of credentials by comma-delimiting, like:
`--auth user1:pass1,user2:pass3`...

load scripts earlier to get errors before model loads

added missing packages to requirements for #74
add support for negative numbers in X/Y plot (plus ranges) #73
changed progressbar to work properly with custom modes

added an option to disable progressbar
added interrupt support to DDIM/PLMS