Resolve "New KM3NeT Dataformat Release v1.2.3"

Closes #55

See merge request !36

Resolve "Parsing of HRV and FIFO status words"

Closes #59

See merge request !40

Resolve "Use km3net_testdata"

Closes #57

See merge request !38

Readme offline

See merge request !35

Resolve "New KM3NeT Dataformat Release v1.2.2"

Closes #52

See merge request !33