Optimized RBEIMSystem by setting the matrix only once during initialization (to the inner-product matrix) and also allowing preconditioner reuse since we typically do many solves with the same matrix.
Optimized RBEIMSystem by setting the matrix only once during initialization (to the inner-product matrix) and also allowing preconditioner reuse since we typically do many solves with the same matrix.

git-svn-id: ffc1bc5b3feaf8644044862cc38c386ade156493@3978 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh