tooltipAnchor option on icons create by iconCreateFunction is ignored

[Etienne-M]

The problem seems to be coming from the fact that the MarkerCluster class is its own icon. See its constructor. But Leaflet's Marker get the tooltip anchor from the option of its icon. See getter method.

There's a couple of easy fixes that we could do:

• Overwrite the getter;
• Merge the options of the icon with the options of MarkerCluster when calling iconCreateFunction;
• Set specifically the tooltipAnchor option when calling iconCreateFunction