Use Sub::Exporter::Progressive instead of S::E
Add a short description
Sort signals correctly after deallocation
Modernize dist.ini
Share signal allocation list between threads
Add tests for signal (de)allocation
Minor documentation fixup
Minor code cleanup
Make ppport slightly happier
v0.013

          Use Sub::Exporter::Progressive instead of Sub::Exporter
          Sort signals correctly after deallocation
          Share signal allocation list between threads