Add format file support for the index command.
Add a link to the index command.
(index)  Return 1 instead of 0 if the directory is empty.
(index)  Add format file support.
It is no longer necessary to preformat results for any command.
Add an error message for attempts to change one address to another
that is identical.
(_alias_reverse_lookup)  Base the lookup on the target,
  not the striptarget, field.
(_changeaddr)  Issue an error if the old and new addresses are identical.
  Bugfix:  Adjust aliases properly when the changeaddr command
  is issued from an alias.  Thanks to Roger Klorese.
Update documentation.
(show)  Substitution correction.
Minor adjustments.
(_changeaddr)  Preserve subscriptions from aliased addresses.
(_unalias)  Correct subscription addresses and alias targets.
White space adjustment.
Allow text files to be read.
Allow a file to be mailed.
Alignment typo.