DOLFIN

Improve SparsityPattern

Registered by Felix Ospald

I recently checked the performance of SparsityPattern using valgrind and noticed that it is not very effective.
The destruction of an instance takes as long as all inserts. This is due to the vector<vector<uint>> for diagonal and off_diagonal.
Also GenericSparsityPattern is missing a factory() method like GenericMatrix etc.

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New
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Unknown
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