Adjust column formatting - names and parsing content

[krlong68]

• Linked to this parkinsonsMetagenomicData issue:
  • In HUMAnN data types, stratified and unstratified types should use the same column names
• In MetaPhlAn header rows, change "database_version" to "chocophlan_version" and "reads_processed" to "number_reads"
• In the MetaPhlAn header "number_reads" column, use regex pattern matching to extract only the integer value. E.g., “#234789 reads processed” -> “234789”