Move 2018/ferguson/prog-simple.c to prog.alt.c

This is to match the rest of the repo as this truly is an alt version,
not a supplementary program.

Updated README.md to have an 'Alternate code' section as well.

A number of files had to be changed as numerous files referred to
prog-simple.c.

2018/ferguson/weasel.1

@@ -4,7 +4,7 @@ weasel \- The IOCCC 2018 Implementation of Richard Dawkins's Weasel program
 .SH SYNOPSIS
 \fBweasel\fP [\fI\-r<rate>\fP] [\fI\-m\fP] [\fI\-q\fP] [\fI<chromosomal string>\fP]
 .PP
-\fBweasel\-simple\fP [\fI\-r<rate>\fP] [\fI\-m\fP] [\fI\-q\fP] [\fI<chromosomal string>\fP]
+\fBweasel.alt\fP [\fI\-r<rate>\fP] [\fI\-m\fP] [\fI\-q\fP] [\fI<chromosomal string>\fP]
 .SH DESCRIPTION
 \fBweasel\fP is an obfuscated implementation of Richard Dawkins' \fIWeasel program\fP.
 According to Wikipedia in chapter three of his book \fIThe Blind Watchmaker\fP Dawkins wrote:
@@ -28,7 +28,7 @@ has several additions: \fBtwo Easter eggs,\fP a \fBquiet output mode,\fP
 an \fBoption to change the mutation rate\fP as well as the ability to
 \fBspecify the chromosomal string.\fP
 Furthermore the keyboard isn't as limited as Dawkins's implementation.
-The \fBweasel\-simple\fP keyboard is a more limited keyboard but not
+The \fBweasel.alt\fP keyboard is a more limited keyboard but not
 as limited as Dawkins's Weasel program keyboard.
 .SH OPTIONS
 .PP
@@ -141,9 +141,9 @@ quiet output from being enabled; on the other hand the options
 The source code to the \fBweasel\fP program.
 .RE
 .PP
-\fI/usr/src/weasel/weasel\-simple.c\fP
+\fI/usr/src/weasel/weasel.alt.c\fP
 .RS
-The source code to the \fBweasel-simple\fP program.
+The source code to the \fBweasel.alt\fP program.
 .RE
 .PP
 \fI/usr/src/weasel/Makefile\fP