add notices to those who wish for a greater challenge

We add the following level-3 header to help people identify text
they may wish to skip if they wish for a greater challenge:

```
```

After that notice we add:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program via the source.

If you get stuck, come back and read below for additional hints and information.
```

And sometimes follow with:

```
```

Or sometimes follow with:

```
```

Where the alt code impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without looking at the Alternate code.

If you get stuck, come back and look at the Alternate code.
```

And where a given command impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without running the command below.

If you get stuck, come back and run the following command:
```

Perform `make www` to perform the above and test under macOS.

tmp/manifest.csv

@@ -1905,7 +1905,7 @@
 2004,hibachi,src/localhost/test/perl/yahoo-ticker.pl,150,true,perl,true,stock price fetch example in Perl
 2004,hibachi,src/configure.in,200,true,shellscript,true,GNU Autoconf script
 2004,hibachi,src/hibachi-start.sh.in,200,true,shellscript,true,hibachi-start.sh declarations
-2004,hibachi,src/localhost/CHANGES-SPOILER.TXT,200,true,text,false,spoiler change log
+2004,hibachi,src/localhost/CHANGELOG.TXT,200,true,text,false,obfuscation change log
 2004,hibachi,2004_hibachi.tar.bz2,1415926535,false,tbz2,false,download entry tarball
 2004,hibachi,README.md,4000000000,true,markdown,true,markdown source for this web page
 2004,hibachi,.entry.json,4000000000,true,json,true,entry summary and manifest in JSON

tmp/path_list.found.txt

@@ -1902,8 +1902,8 @@
 2004/hibachi/src/configure.in
 2004/hibachi/src/hibachi-start.sh
 2004/hibachi/src/hibachi-start.sh.in
+2004/hibachi/src/localhost/CHANGELOG.TXT
 2004/hibachi/src/localhost/CHANGES-OBFUSCATED.TXT
-2004/hibachi/src/localhost/CHANGES-SPOILER.TXT
 2004/hibachi/src/localhost/Img/cygwin-icon.gif
 2004/hibachi/src/localhost/Img/freebsd.gif
 2004/hibachi/src/localhost/Img/hibachi-256-oc-nc-300x150.gif

tmp/path_list.manifest.txt

@@ -1902,8 +1902,8 @@
 2004/hibachi/src/configure.in
 2004/hibachi/src/hibachi-start.sh
 2004/hibachi/src/hibachi-start.sh.in
+2004/hibachi/src/localhost/CHANGELOG.TXT
 2004/hibachi/src/localhost/CHANGES-OBFUSCATED.TXT
-2004/hibachi/src/localhost/CHANGES-SPOILER.TXT
 2004/hibachi/src/localhost/Img/cygwin-icon.gif
 2004/hibachi/src/localhost/Img/freebsd.gif
 2004/hibachi/src/localhost/Img/hibachi-256-oc-nc-300x150.gif

tmp/path_list.required.txt

@@ -1259,8 +1259,8 @@
 2004/hibachi/src/configure.in
 2004/hibachi/src/hibachi-start.sh
 2004/hibachi/src/hibachi-start.sh.in
+2004/hibachi/src/localhost/CHANGELOG.TXT
 2004/hibachi/src/localhost/CHANGES-OBFUSCATED.TXT
-2004/hibachi/src/localhost/CHANGES-SPOILER.TXT
 2004/hibachi/src/localhost/Img/cygwin-icon.gif
 2004/hibachi/src/localhost/Img/freebsd.gif
 2004/hibachi/src/localhost/Img/hibachi-256-oc-nc-300x150.gif