[Swan-commit] Changes to ref refs/heads/master

[D. Hugh Redelmeier]

New commits:
commit b0ed9e32115030c38eba2af59e0a758e4cb40af9
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Sun Mar 17 17:35:59 2019 -0400

    pluto: refactor revival code.
    
    - create and use find_revival(), free_revival()
    
    - for consistency, change arg of add_revival() to be a connection;
      rename flush_revival_by_connection => flush_revival
    
    - add comments about revival mechanism