Support RevertLine for lines from previous sessions
Move Ctrl+V entry for Get-PSReadlineKeyHandler output
*SearchHistory to recall current line

Like ordinary recall history, when you use the down arrow, you
eventually recall the current line (which is typically empty
but not always.)

SearchHistory was stopping at the first match instead of getting
back to the current line (which will be exactly the search string.)
Add test to test list
Tweak for easier testing
Reset current history index when done w/ recall

After a series of UpArrow/DownArrow (or whatever keys
are bound to the history search/recall), I am reseting
the current history index.  This avoids a problem where
the current line might not match the line saved in history
for that history index.

There is a small change in behavior that some might notice.
Say you are searching for some command, but you can't think
of something unique to search for in that exact command, but
you do remember something you can search for in a command entered
near that command actual command you want.

Before this change, you could use Ctrl+R to find the command near
the one you want, then use up/down arrows to get to the exact
command.

This will no longer work after this fix.  Any other fix will
likely be more complicated, so if folks ever noticed the previous
behavior and complain that it no longer works.

Fixes #97
Fix small bug with history no duplicates

Up/Down arrow with "no duplicates" would cause an exception
if you tried to go beyond the start/end of history.
Support menu completion

If completion is ambiguous, we will support interactively selecting
the completion using tabs and/or arrow keys after displaying the
possible completions.

This menu style completion can be cancelled with Ctrl+G or Escape.

Menu completion should be optional as not everybody will like it,
I will add an option and/or a function that makes this something
folks can customize.

Also fixed:
    * Tooltips that contain newlines now look much better
    * Undo groups handled a little better (maybe a non-issue before
      menu completion.)
Fix menu completion for scrolling and wrapping

Menu completion would crash PowerShell when invoked from the end of the buffer.
The display also got messed up when the selected completion caused the line
length to exceed the buffer width and hence required wrapping.
Add MenuComplete function

Some folks won't like the way menu complete works and the cleanest
way to invoke it is as a bindable function, so I'm adding that.

I considered emulating zsh more closely, but zsh is a little weird in
when it removes the possible completions.
Ensure completion menu is visible

When displaying the completion menu, it might be rendered in a
non-visible area and needs to be made visible.
Recall the saved current line after end of history

When starting a search through history, we saved the
current line.  A refactoring broke recalling this
saved line in one case (the default) so I added
some tests to make sure it doesn't regress again.
Update Changes.txt
Add samples for marking/jumping to directories

For quick navigation, these examples let you mark a directory
and jump back to a directory with a couple of keys, all without
affecting the current command line.
Auto-save history

Added options to save history automatically - either at exit or incrementally so that history can be shared across sessions.
Default is current to save incrementally.
Also added an option to not save history - useful for those importing history in their profile.
Small fix to MenuComplete

The cursor was placed incorrectly when showing the menu
at the bottom of the screen if you hadn't reached the
end of buffer yet.
Update help for Ctrl+r/Ctrl+s
Update changes
Fix initial creation of directory for history file.
Update help for history saving options