v4.3.1

• fix vpx encoder
• errors when using the 'password-file' command line option
• bash path compatibility issue with source commands
• ssh errors with some versions of paramiko
• failures to locate existing servers (ie: remote start / attach)
• dpi errors with desktop servers, causing blurry scaling
• 'video-scaling' argument parsing errors
• duplicate dpi xsettings
• avoid resource leak warning
• proxy video encoder errors
• update some of the failing unit tests
• MacOS broken helper commands, pixbuf loader path errors
• MacOS packaging of spng codec
• try harder to locate the html5 client installation path
• handle source command stdout pollution, trap all errors