Log Message:
Changes 2.5:
* Support for colour separated PDF output and other optimisations and
  features for high-quality printing, including enforcement of colour
  models for CMYK, RGB, and "spot colours"
* Long table optimisations are now turned on by default.  Previously,
  documents with very long tables spanning many pages could take a long
  time to create because we considered the whole table to work out row
  and column sizes.  A patch was submitted some time ago to fix this
  controlled by a flag in the rl_config file, but this was set 'off'
  for compatibility.  Users are often not aware of this and we haven't
  found any real-world cases where the new layout technique works badly,
  so we are turning this behaviour on.
* New support for QR barcodes.