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Simple backend-independent plotting for PDL

Changes for 1.011 - 2024-04-22

  • P{GPLOT,Lplot} to read devices using proper API not subprocesses
  • if PDL_SIMPLE_ENGINE in ENV, use ONLY that if engine unspecified
  • each driver module now publishes which $P:G:S::API_VERSION it conforms to
  • PGS::register takes hashref instead of magic var in driver namespace
  • loading driver module not eval-ed
  • PDL_SIMPLE_DEVICE in env replaces driver guessing
  • PDL_SIMPLE_OUTPUT in env overrides input parameters