Feature: report write disk error when disk is full.

[han-k59]

When my phone disk is full, the debug files are written with 8 bytes only. For files see link in Cloudynights forum.

I assume it would be easy to detect and report a "write disk error".

[artyom-beilis]

I need to build error notifications channel indeed.

I explain. Almost all stacking control operations are asynchronous. That means it all run in different threads in background.

I need to build a error notifications push system that would send a error to the browser telling something goes wrong for asynchronous events.

[artyom-beilis]

Fixed in 2d52034