** Changes in Allout

*** Topic cryptography added, enabling easy gpg topic encryption and
decryption.  Per-topic basis enables interspersing encrypted-text and
clear-text within a single file to your heart's content, using symmetric
and/or public key modes.  Time-limited key caching, user-provided
symmetric key hinting and consistency verification, auto-encryption of
pending topics on save, and more, make it easy to use encryption in
powerful ways.

*** Changed default command prefix to "\C-c " (control-c space), to avoid
intruding on user's keybinding space.  Customize the
`allout-command-prefix' variable to your preference.

*** Converted to use text overlay's `invisible' property (and others) for
concealed text, instead of selective-display.  This simplifies the code, in
particularly avoiding the need for kludges for isearch dynamic-display,
discretionary handling of edits of concealed text, undo concerns, etc.

*** many substantial fixes and refinements, including:

   - repaired inhibition of inadvertent edits to concealed text
   - repaired retention of topic body hanging indent upon topic depth shifts
   - refuse to create "containment discontinuities", where a
     topic is shifted deeper than the offspring-depth of its' container
   - bulleting variation is simpler and more accommodating, both in the
     default behavior and in ability to vary when creating new topics
   - many internal fixes and refinements
   - many module and function docstring clarifications
   - version number incremented to 2.2