Absolute scale option (snore recordings) for entire night, not just a single section

From sleeper on 2015/12/17 11:23:27 +0000

Rather than the auto scale that we get for each section, all sections for the night are scaled auto scaled to the loudest noise, That way it would be possible to scan the sections quickly and see how they compare to each other. Additionally when viewing sections, the duration of the section should be displayed rather than date.

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/11121678-absolute-scale-option-snore-recordings-for-entir