Add CODE_OF_CONDUCT.md

with the No Code of Conduct text,
links to the conflicting development policies of p5p vs cperl
and links to https://nocodeofconduct.com/
Closes #226

Author: Reini Urban

CODE_OF_CONDUCT.md

@@ -0,0 +1,15 @@
+# Contributor Code of Conduct
+
+This project adheres to **No Code of Conduct**.
+
+We are all adults.
+We accept anyone's contributions.
+If you are feeling harrassed speak up by yourself.
+We do not censor, we don't stop any discussions.
+Nothing else matters.
+
+Compare the conflicting [p5p STANDARDS OF CONDUCT](http://perldoc.perl.org/perlpolicy.html#STANDARDS-OF-CONDUCT), which was abused to silence technical criticism and demeaning technical remarks on the maintainership in the last years, and the [cperl development policies](http://perl11.org/cperl/perlcperl.html#Development-policies).
+cperl can stand criticsm and encourages criticism, but doesn't allow abuse.
+perl5 silences them via code of conduct and still is toxic and effectively dead.
+
+For more information please visit the [No Code of Conduct](https://nocodeofconduct.com) homepage.

MANIFEST

@@ -14,6 +14,7 @@ caretx.c		C file to create $^X
 cflags.SH		A script that emits C compilation flags per file
 Changes			Describe how to peruse changes between releases
 charclass_invlists.h	Compiled-in inversion lists
+CODE_OF_CONDUCT.md	Contributor Code of Conduct
 config_h.SH		Produces config.h
 configpm		Produces lib/Config.pm
 Configure		Portability tool

t/porting/filenames.t

@@ -72,8 +72,9 @@ PATHNAME: for my $pathname (@files) {
         fail("$pathname has more than 39 characters after the dot");
     } elsif ($filename =~ /^(?:CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9])\./i) {
         fail("$pathname has a reserved name");
-    } elsif ($filename =~ /\s|\(|\&/) {
-        fail("$pathname has a reserved character");
+    } elsif ($filename =~ /(\s|\(|\&)/) {
+        # detects a missing tab
+        fail("$pathname has a reserved character ($filename: $1)");
     } else {
         pass("$pathname ok");
     }