Release v0.6.4

• binary files are now longer matched when reading diags, this should allow all those pesky zips to be skipped
• sperf core statuslogger now reads debug.logs as well as system.logs by
  default. Added additional testing to validate there is no double counting.
• DSE 6.8 sperf core statuslogger support
• DSE 6.8 additional testing for sperf core diag, sperf core schema,
  sperf core slowquery and the default sperf command
• sperf core statuslogger now defaults to showing all stages to give a more full explanation of what is going on by default. Most people didn't know the 'al stages' flag existed
  and this is largely to force people to narrow their search intentionally. The initial experience maybe overwhelming, but this will make it more likely people will catch outliers
  and therefore problems in clusters.