NA62 data format

The latest version of the living note summarizing most of the information concerning NA62 data formats can be found here: DataFormats.pdf

The definition of the trigger type word is reported here: TriggerTypeWord is a 32-bit unsigned integer indicating the L0 trigger type (the lowest 8 bits, assigned by the L0 Trigger Processor), L1 trigger type (the second 8 bits, assigned by the L1TriggerProcessor), and the L2 trigger type (the third 8, assigned by the L2TriggerProcessor); the upper 8 bits are reserved, 0x0 is not a valid trigger type.