hydra-evaluator: Allow setting the maximum number of concurrent evaluations

Dependencies

• [2] W4G5MZZS hydra-evaluator improvements
• [3] 4YCF3KBG Concurrent hydra-evaluator

Change contents

• edit in src/hydra-evaluator/hydra-evaluator.cc at line 1
  [3.575]→[3.576:597](∅→∅)
  − #include "shared.hh"
• edit in src/hydra-evaluator/hydra-evaluator.cc at line 2
  [3.614]

  [3.614]
  + #include "hydra-config.hh"
• edit in src/hydra-evaluator/hydra-evaluator.cc at line 4
  [3.633]

  [3.633]
  + #include "shared.hh"
• edit in src/hydra-evaluator/hydra-evaluator.cc at line 20
  [3.780]

  [3.780]
  + std::unique_ptr<Config> config;

  +
• replacement in src/hydra-evaluator/hydra-evaluator.cc at line 36
  [2.221]→[3.1102:1127](∅→∅),[3.1102]→[3.1102:1127](∅→∅)
  − size_t maxEvals = 4;
  [2.221]

  [3.1127]
  + const size_t maxEvals;
• edit in src/hydra-evaluator/hydra-evaluator.cc at line 50
  [3.1394]

  [3.1394]
  +

  + Evaluator()

  + : config(std::make_unique<::Config>())

  + , maxEvals(std::max((size_t) 1, (size_t) config->getIntOption("max_concurrent_evals", 4)))

  + { }