Check for firmware_node/status if bay is occupied

Dell Latitude BIOS/ACPI has bug which cause that docked attribute is always 0.
So check for firmware_node/status which is non zero when bay is occupied.
Note that on older kernels firmware_node/status is not available.
Powering off UltraBay/MediaBay working on any laptop which support it via ACPI

Recently it is supported only on ThinkPad and Latitude BIOS/ACPI.
Add support for energy perf policy (it needs kernel module msr and program x86_energy_perf_policy from linux-tools)
Add option for excluding power management for radeon graphics cards

Kernel driver radeon implements its own runtime power management which
automatically turn on/off radeon graphics cards. It is better than TLP.
Flush cache and wait more seconds before undocking drive bay
Add note about governor for pstate driver
Add support for intel pstate perf pct
Add support for enabling and disabling radio devices on AC and battery
Add support for disabling only those radio devices which are not in use
Show state of bluetooth and wifi devices if are in use
Recommends linux-tools on debian