Added utility rstrip() to remove whitespace at the right end of a string.

utils.cpp

@@ -77,3 +77,12 @@ QString Utils::getTariffLoadTime(QString fileName) {
     return "N/A";
 }
 
+QString Utils::rstrip(QString const &str) {
+    int n = str.size() - 1;
+    for (; n >= 0; --n) {
+        if (!str.at(n).isSpace()) {
+            return str.left(n + 1);
+        }
+    }
+    return "";
+}