format: Add 'default' format option (bug #62430) * pr-output.cc (set_format_style): Add format option 'default' to set the same state as if format was called without arguments and overrides other format options if multiple options are provided. * pr-output.cc (format): Update docstring with changes about new 'default' option, function calling form, and errors when both inputs and outputs are specified. * NEWS.8.md: Note change under Matlab Compatability.

--- a/etc/NEWS.8.md	Mon May 09 12:58:05 2022 -0400
+++ b/etc/NEWS.8.md	Mon May 09 13:58:46 2022 -0400
@@ -33,6 +33,9 @@
 - `print` now accepts option `-image` to specify the "opengl" renderer
   and `-vector` to specify the "painters" renderer.
 
+- `format` now accepts the option "default", which is equivalent to
+  calling `format` without any options to reset the default state.
+
 ### Alphabetical list of new functions added in Octave 8