Viudita

• Now able to read gzipped csv files
• Part 2 Fixed midnight selection being off by one sample
• Part 1 tidied up metric calculation and added a few metrics
• Part 2 Added strategy 4 (ignore data before first midnight)
• Data from movisens accelerometers can be now processe
• Part 5 timestamps in timeseries output in RData format (new since 2.0)
  now correctly accounts for timezone
• Part 4 now has option to only exclude the first or only the last night