This fixes a unit test bug where on Windows it was trying to load a utf-8 file as some other encoding starting with "cp".

Updated to reflect that the default value of abbrev is now False.

It was pretty useless, it just printed a message and sat there and waited for the user to hit enter.

It didn't feel like it belonged in a top-level framework.  If a particular application wants this functionality, it is a 2 line change to add it back.

Added information related to the new pyscript command.

The old way of running Python scripts via "py run()" should be considered deprecated.  The new "pyscript" command
is superior in two significant ways:
1) It supports tab-completion of file system paths
2) It allows the user to pass command-line arguments to scripts

Updated these to reflect that the list command has been removed

Due to the way the parsing logic works for multiline commands, abbreviations didn't function properly with mutliline commands.  So to avoid confusion, this commit deals with this issue by simply disallowing abbreviations for multiline commands altogether.

A warning has been added to the section on abbreviations in the documentation to hopefully make this clear for users.

A few other miscellaneous minor tweaks for whitespace and such.

- Added a new section on application life cycle and hook methods
- Moved a warning to a more appropriate location
- Added a note about using allow_redirection to disable output redirection and pipes