lightr 1.9.0

New features

• cases where a mix of .csv and other 'csv-like but not quite csv' formats are
  passed to lr_get_spec() are now handled better, after a report from @bittonp
  (@Bisaloo, #58). This also means that it's no longer necessary to explicitly
  set sep = "," when trying to parse csv files (#15).
• lr_parse_procspec() gains a new argument verify_checksum to verify if the
  data has been tampered with since its creation by the official OceanView
  software (@Bisaloo, #29).
• lr_parse_spc() (OceanOptics, CRAIC) and
  lr_parse_rfl8()/lr_parse_raw8()/lr_parse_irr8() (Avantes) now return the
  measurement date & time in the metadata elements (@Bisaloo, #75). In other
  words, lr_get_metadata() now return savetime for .spc, .RFL8, .RAW8,
  IRR8 files.