Small but very annoying issue with modifiers meant that G.totvert/totedge/totface
were updated to reflect the effects of a subsurf modifier in object mode but all other
modifier types were ignored. This was not only inconsistent, but also made it very
difficult to keep track of poly budgets. Now in order to obtain accurate counts
object_handle_update is called immediatly after adding a modifier and precedes a call
to countall() which has been modified to query the final derived mesh directly
using dm->getNumVerts/Edges/Faces callbacks. Editmode behaviour is unchanged.
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