message: DOC: document updates for LinearSolve()
diff: @@ -103,6 +103,13 @@ Discretization improvements
  Linear and nonlinear solvers
  ----------------------------
  +- LUFactors::Factor() now returns a status that is equal to 0 if the LU factoriazation
  + is successful, non-zero otherwise.
  +
  +- Added a LinearSolve(A,X) convenience method to solve linear systems. In the trivial
  + cases, i.e., square matrices of size N=1 or N=2, the system is solve directly,
  + otherwise, LU Factorization is employed.
  +
  - Added a general interface for specifying and solving nonlinear constrained
  optimization problems through the new classes OptimizationProblem and
  OptimizationSolver, see linalg/solver.hpp
  