use keV as output energy
update license

update year
add my name
correct year used in license
fix license years and names alignment
refactor min max energy handling

all CPU values are now in keV
concert to PIConGPU units only before kernel call
update comments
add pragma once
fix typo
convert tabs to 4 spaces
fix comment
Merge pull request #317 from PrometheusPi/fixHeaderBinEnergyPlugin

use keV as output energy