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Inserts a 0-cell in the 2-cell containing dh.
The 2-cell is split in triangles, one for each initial edge of the facet.
Returns a handle on one dart belonging to the new 0-cell.
| Precondition: | CMap::dimension≥2 and *dh∈cm.darts().
See example in Figure 27.12.
If 2-attributes are non void,
Attribute_type<2>::type::On_split(a,a') is called, with a the original 2-attribute associated
with dh and a' each new 2-attribute created during the operation. |
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