Multilke anchors with member-group

When running a link checker on the CGAL (e.g. AABB_tree package) we get a lot of warnings like:
```
Processing      file:///.../doc_output/AABB_tree/classCGAL_1_1AABB__tree.html

List of duplicate and empty anchors
        member-group    Lines: 191, 229, 258, 297, 316, 335, 347
```

The member-group anchor is shown like:
```
<a name="member-group"></a>
```
and create each time the `\name` command is used. the `\name` command can be used multiple times on a page.
There is (no way to) reference the anchor (like `<a href="#member-group">...`)  found in the doxygen code.

Setting the name to the empty string prevents the anchor from being created.

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