Adding dummy Map annotation

This adds a map annotation using comment annotation pending the
creation of the setMapAnnotationValue function in MetadataStore

Test with:
./showinf -omexml -nopix dummy\&series=2\&sizeZ=5\&annLong=2\&annDouble=3\&annMap=1.fake

This will make:

      <CommentAnnotation ID="Annotation:5" Namespace="fake-reader">
         <Value>{keyS0N6=val42, keyS0N7=val48, keyS0N8=val54, keyS0N9=val60, keyS0N2=val18, keyS0N0=val6, keyS0N3=val24, keyS0N1=val12, keyS0N4=val30, keyS0N5=val36}</Value>
      </CommentAnnotation>
      <CommentAnnotation ID="Annotation:11" Namespace="fake-reader">
         <Value>{keyS1N1=val24, keyS1N2=val36, keyS1N3=val48, keyS1N4=val60, keyS1N5=val72, keyS1N6=val84, keyS1N7=val96, keyS1N8=val108, keyS1N9=val120, keyS1N0=val12}</Value>
      </CommentAnnotation>

Where the map annotations should go.

The correct code using setMapAnnotationValue is present but commented out.
Merge remote-tracking branch 'gh/new-map' into new-map