[Dolfin] linear solvers

[Garth N. Wells]

At the moment, a linear solver is not associated with a particular 
matrix. This makes it awkward and dangerous to re-use preconditioners, 
factorisations, etc. I suggest that we change the interface of the 
linear solver classes to accept a matrix at construction, and that the 
solvers maintain a (smart) pointer to the matrix. Opinions?

Garth
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