* Enabled by default
* Based on static thresholds per pass.
* Pass 1: 85%
* Pass 2: 98%
* If using child devices, all must be above the threshold to continue
* Updating device / child device status/progress done in mark_*() functions
* Add current pass description to main menu
* Current pass (overall) only updated if all children have passed
* Fix Pass 4 crash
* Refresh rate is now handled by 'watch --interval'
* Allows for much simpler ddrescue execution / tracking
* Removed all 'SMART Report' sections from functions/ddrescue.py
* functions/hw_diags.py has been further extended
* Supports full device paths (only for displaying attributes ATM)
* Adds a timestamp when only displaying attributes
* Common code moved to select_device()
* Existing select_device() renamed menu_select_device()
* Fixed skip_device code
* Refactored source/dest vars into dicts
* Added confirmation after source/dest are selected