- Extends the algorithms compatible with bytecode to compute the  steady-state (ticket #11). The new values for solve_algo are:
   * 0: fsolve
   * 1: solve1
   * 2, 4: solve1 + block decomposition
   * 3: csolve
   * 5: LU decomposition with UMFPack (method handling sparse matrix in Matlab)
   * 6: GMRES
   * 7: BiCGStab
   * 8: bytecode own solver (use Gaussian elimination + sparse matrix)

- Bytecode can now evaluate a specific block instead of the overall blocks (new bytecode's option 'Block = block_number')