* usr/bin/byobu-select-session: LP: #1241785
  - rework session selecting, especially when nesting
  - support an environment variable BYOBU_NESTING=1 which users can
    set to force nesting (rather than modifying the TERM variable
    which other programs rely upon)
  - add an interactive step, where users can immediately choose to
    run in a nested session
releasing 5.61
opening 5.62