Adjust settings.m ...

* Adjust usage descriptions.
* Add Settings`$UseUnicode.

mathicsscript/settings.m

@@ -7,16 +7,19 @@
 (**********************************************************************)
 
 
-Settings`$ShowFullFormInput::usage = "If this variable is set nonzero, mathicsscript shows the input in FullForm before evaluation.
+Settings`$ShowFullFormInput::usage = "If this Boolean variable is set True, mathicsscript shows the input in FullForm before evaluation.
 
 Note this is for input entered, not the output of the evaluated result.
 "
 
 Settings`$ShowFullFormInput = False
-Settings`$PygmentsStyle::usage = "This sets the Pygments style used to colorize output. The value should be a string.
+Settings`$PygmentsStyle::usage = "This variable sets the Pygments style used to colorize output. The value should be a string.
 
 The default value changes background depending on whether the terminal has a light or dark background. You can also set the color style used on the command with the ``--style`` option, or look at the variable ```Settings`PygmentsStylesAvailable```. Or it can be set in the settings.m file."
 
-Settings`$PygmentsShowTokens::usage = "Setting this True will show Pygments tokenization of the output."
+Settings`$PygmentsShowTokens::usage = "Setting this variable True will show Pygments tokenization of the output."
 
 Settings`$PygmentsShowTokens = False
+
+Settings`$PygmentsStyle::usage = "This Boolean variable sets whether Unicode is used in terminal input and output."
+Settings`$UseUnicode = True