Connect to local server from admin client if possible
Fix async texture readback

Use PBO readback when available, texture otherwise to support Mesa OGL 1.4
Merge pull request #392 from tribal-tec/master

Add default connection for autoconfigured server, Fix async texture readback
Allow set of entire window settings; can be useful to transfer settings in the admin side
Merge pull request #394 from tribal-tec/master

Allow set of entire window settings; can be useful to transfer settings in the
Override context
Override GLWidget
Cleanup