simmer 4.0.1

New features:

• New getters (#159):
  • get_sources() and get_resources() retrieve a character vector of source/resource names defined in a simulation environment.
  • get_trajectory() retrieves a trajectory to which a given source is attached.
• New resource selection policies: shortest-queue-available, round-robin-available, random-available (#156). These are the same as the existing non-available ones, but they exclude unavailable resources (capacity set to zero). Thus, if all resources are unavailable, an error is raised.

Minor changes and fixes:

• Rename -DRCPP_PROTECTED_EVAL (Rcpp >= 0.12.17.4) as -DRCPP_USE_UNWIND_PROTECT (6d27671).
• Keep compilation quieter with -DBOOST_NO_AUTO_PTR (70328b6).
• Improve log_ print (7c2e3b1).
• Add when_activated() convenience function to easily generate arrivals on demand from trajectories (#161 closing #160).
• Enhance schedule printing (9c66285).
• Fix generator-manager name clashing (#163).
• Deprecate set_attribute(global=TRUE), get_attribute(global=TRUE) and timeout_from_attribute(global=TRUE) (#164), the *_global versions should be used instead.