Expand part 6 functionality with more Circadian rhythm and fragmentation indicators

[vincentvanhees]

Following on from #906 where I build the framework for part 6:

• Integrate DFA work in part 6: Implement DFA analysis #839
• Create csv report based on milestone data
• Integrate IVIS:
  • Update central IVIS function based on recent feedback and include it in part 6
  • Simplify IV and IS in part 2 to just cosinor variant and rename variable names to be IS and IV
• Integrate TP just like part 5 but, but now calculate per recording instead of per day.
• Remove Circadian rhythm metrics from part 5 => not needed, because only TP is used there and probably best to keep there in line with day(segment) specific fragmentation analyses.
• Improve accounting for save_ms5raw_without_invalid = TRUE, because currently this needs to be set differently depending on how part6Window is set => Ideally, part 6 should be able to work regardless of how save_ms5raw_without_invalid is set. => update: I do not think this is a real concern
• Ask Ian Danilevicz to help check and help revise vignette documentation.