Export Linux EDAC metrics

[SuperQ]

/sys/devices/system/edac contains a number of useful metrics for hardware problem detection.

See additional info:
http://bluesmoke.sourceforge.net/
http://buttersideup.com/edacwiki/Main_Page

[SuperQ]

Here's some additional info on some of the files in sys.

http://www.admin-magazine.com/Articles/Monitoring-Memory-Errors

[discordianfish]

-> #324

[SuperQ]

Fixed via #324