Imported evdev helper functions to mce source tree
Imported event device trace/identify tool to mce source tree
Updated header dependencies
Build and install rules added for evdev_trace tool
Use functions from evdev.c to improce input event diagnostics

On debug verbosity mce will print event type, code and value
before processing the events.

Also removed a function made redundant by evdev.c
Merge pull request #29 from spiiroin/evdev_trace

Add evdev_trace tool to mce-tools package and improve mce event input diagnostics