Started implementing load/save functionality

data/examples/saved-chart.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<chartinfo>
+    <data>
+        <name>Gergely Polonkai</name>
+        <place>
+            <country>Hungary</country>
+            <city>Budapest</city>
+            <longitude>47.49801</longitude>
+            <latitude>19.03991</latitude>
+        </place>
+        <time>
+            <year>1983</year>
+            <month>3</month>
+            <day>7</day>
+            <hour>11</hour>
+            <minute>54</minute>
+            <second>45</second>
+        </time>
+    </data>
+</chartinfo>