Decode encoded labels

Before:

After:

• filesystem labels added to JSON when found
• -l launch argument adds a "label" column to the table

New --units launch argument to choose between SI (default) and binary.

Project is complete

(until somebody finds a problem)

better identify mapped devices (such as LVM)

Fix endless loop in some configurations - Fix #13

• --color option with values yes|no|auto (auto being default)
• no tty style when --color is default and the output is piped

Fix BTRFS disks not found - Fix #11

use termimad 0.13 for better support of narrow terminals and wide chars

Better table rendering in narrow terminals