2.8

• switched to disposable-irods 1.3 (iRODS packages from Sanger S3,
  replaced RENCI FTP site)
• added single-server option
• added support for data files to change during the tar process
  and to detect and archive those changes
• individually check the checksum of files local to the gridionxi
  where they are loaded and compare with the iRODS checksum
• updated the samtools and htslib versions to 1.7
• added tar file auditor
• use manifest checksums to confirm file contents
• support loading PacBio RSII files created using out of date reagents
• allow a user-supplied checksum to be used in TarPublisher and TarStream
  (so GridIONRunPublisher can allow the checksum of uncompressed data to be used)
• publish fastq files during the catchup phase
• allow auditing of older GridION tar files which used a relative path for tarred files
• archiving changes for illumina sequencing genotype files
• fix for the regex used when choosing to ignore files
• minor fix to DataObjectFactory.pm