Fix regression bug in 6.12.0 (#77)

• Security fix in trailing path for pseudo-devices (Additional anchor for security)
• Update help
• Add Erase_Fail_Count_Total to default raw list
• Fix NVMe perfdata (issue 74)

Extended change description: https://www.claudiokuenzler.com/blog/1154/check_smart-6.12-security-nvme-performance-data-fix-erase-fail-count-total

Release 6.11 adds two improvements to the plugin:

• 62

• 70

The primary focus is clearly on issue #70. Internally the "non-ok drives" are now split into "warning" and "critical" drives. This allows a proper sorting of the drives.