BlockDavidsonInitFailure is thrown when the BlockDavidson solver is
unable to generate an initial iterate in the
BlockDavidson::initialize() routine.
This exception is thrown from the BlockDavidson::initialize() method,
which is called by the user or from the BlockDavidson::iterate()
method if isInitialized() == false.
In the case that this exception is thrown,
BlockDavidson::isInitialized() will be false and the user will need to
provide a new initial iterate to the solver.
C++ includes: AnasaziBlockDavidson.hpp