graph: added 0.5 point radius option

public/app/plugins/panel/graph/tab_display.html

@@ -43,7 +43,7 @@
 			<div class="gf-form">
 				<label class="gf-form-label width-8">Point Radius</label>
 				<div class="gf-form-select-wrapper max-width-5">
-					<select class="gf-form-input" ng-model="ctrl.panel.pointradius" ng-options="f for f in [1,2,3,4,5,6,7,8,9,10]" ng-change="ctrl.render()" ng-disabled="!ctrl.panel.points"></select>
+					<select class="gf-form-input" ng-model="ctrl.panel.pointradius" ng-options="f for f in [0.5,1,2,3,4,5,6,7,8,9,10]" ng-change="ctrl.render()" ng-disabled="!ctrl.panel.points"></select>
 				</div>
 			</div>
 		</div>