Fix std::stoi exception

Dependencies

• [2] NSBNNM77 Add hydra.conf option "nar_buffer_size" to configure memoryTokens limit
• [3] BG6PEOB2 Make the output size limit configurable
• [*] 24BMQDZA Start of single-process hydra-queue-runner

Change contents

• replacement in src/hydra-queue-runner/hydra-queue-runner.cc at line 55
  [2.972]→[2.972:1036](∅→∅)
  − return i == options.end() ? def : std::stoi(i->second);
  [2.972]

  [2.1036]
  + return i == options.end() ? def : std::stoll(i->second);