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of log and pow functions so as to insure non-negative arguments

(complement to commit cd0bc28e)

numbers. This should be 2*imag(g1) and not imag(g1).^2

continue after homotopy fails. Option stop_on_error is removed. Option
homotopy_force_continue is added.

nocheck to 'check' in test fs2000/fs2000a as there is a unit root and
the user provided _steadystate.m doesn't solve the static equations

to the preprocessor, added to documentation

- Adds new algorithms to solve Lyapunov equations: Doubling algorithm and Square root solver. Their respective names are "doubling" and "square_root_solver".
- Adds the tolerance criteria for the iterative solvers (sylvester_fixed_point_tol, lyapunov_fixed_point_tol and lyapunov_doubling_tol)
- Updates the reference manual

Closes: #241

continue (for example, when chaining homotopy steps), even if the
steady state computation was not successful.