maint: Update source file encodings to UTF-8 and fix character errors * scripts/help/doc.m, scripts/help/lookfor.m, scripts/help/private/__additional_help_message__.m, scripts/help/private/__strip_html_tags__.m, scripts/miscellaneous/tar.m, scripts/miscellaneous/untar.m, scripts/miscellaneous/unzip.m: Update file encoding to UTF-8. * etc/OLD-ChangeLogs/scripts-ChangeLog, scripts/geometry/inpolygon.m, scripts/help/__makeinfo__.m, scripts/help/doc_cache_create.m, scripts/help/get_first_help_sentence.m, scripts/help/help.m, scripts/help/print_usage.m, scripts/help/type.m, scripts/pkg/pkg.m: Restore correct characters in contributor names instead of UTF-8 replacement character.

--- a/scripts/geometry/inpolygon.m
+++ b/scripts/geometry/inpolygon.m
@@ -1,5 +1,5 @@
 ## Copyright (C) 2006-2012 Frederick (Rick) A Niles
-##               and S�ren Hauberg
+##               and Søren Hauberg
 ##
 ## This file is part of Octave.
 ##
@@ -30,7 +30,7 @@
 ## Author: Frederick (Rick) A Niles <niles@rickniles.com>
 ## Created: 14 November 2006
 
-## Vectorized by S�ren Hauberg <soren@hauberg.org>
+## Vectorized by Søren Hauberg <soren@hauberg.org>
 
 ## The method for determining if a point is in in a polygon is based on
 ## the algorithm shown on