Added CHANGELOG.md and .extract_section.sh script (copied from FETK implementation)

.extract_section.sh

@@ -0,0 +1,49 @@
+#! /bin/bash
+
+while getopts f:v: flag
+do
+    case "${flag}" in
+        f) filename=${OPTARG};;
+        v) version=${OPTARG};;
+    esac
+done
+
+if [ -z "$filename" ]; then
+    echo "Please specify a filename using '-f'"
+    exit 1
+fi
+
+if [ ! -f $filename ]; then
+
+    echo "File does not exist: ${filename}"
+    exit 1
+
+fi
+
+if [ -z "$version" ]; then
+    echo "Please specify a version using '-v'"
+    exit 1
+fi
+
+#echo "Analyzing file $filename"
+header="## ${version}"
+#echo "Section title: <${header}>"
+
+foundTitle=false
+while read line; do
+    if [ "$foundTitle" == false ]; then
+        if [[ "$line" =~ ^${header} ]]; then
+            foundTitle=true
+        fi
+    else
+        if [[ $line = '## '* ]]; then
+            break
+        else
+            echo "$line"
+        fi
+    fi
+done <$filename
+
+if [ "$foundTitle" == false ]; then
+    echo "[No changes were documented]"
+fi

CHANGELOG.md

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+# APBS Changelog
+
+## 3.3.0.alpha
+
+Dec 10, 2021
+
+* An amazing update
+* Another amazing update
+* A stupendous update
+
+## 3.2.1
+
+Sep 16, 2021
+
+## 3.0.0
+
+May 29, 2020
+
+## 1.5.0
+
+Oct 17, 2016
+
+## 1.4.2.1
+
+Jan 15, 2016
+
+## 1.4.2
+
+Jan 6, 2015