Add more tests with the option warm-start

[amontoison]

It seems that in some corner cases, the correct solution is not returned.
If x0 is the exact solution of Ax = b, it's possible that I return x = 0 but the residual of the shifted system is zero.

[amontoison]

I need to fix almost all methods...
The good news is that TriLQR can handle the exact solution with warm-start 😛
TriLQR is not checking if the initial residual is 0.

Test Summary:           | Pass  Fail  Total  Time
warm-start              |  108    50    158  3.4s
  Data Type: Float64    |   54    25     79  0.2s
    bilqr               |    4     2      6  0.0s
    trilqr              |    6            6  0.0s
    tricg               |    2     2      4  0.0s
    trimr               |    2     1      3  0.0s
    gpmr                |    2     1      3  0.0s
    minres_qlp          |    2     1      3  0.0s
    symmlq              |    2     1      3  0.0s
    cg                  |    2     1      3  0.0s
    cr                  |    2     1      3  0.0s
    car                 |    2     1      3  0.0s
    cg_lanczos          |    2     1      3  0.0s
    minres              |    2     1      3  0.0s
    minares             |    2     1      3  0.0s
    diom                |    2     1      3  0.0s
    dqgmres             |    2     1      3  0.0s
    fom                 |    2     1      3  0.0s
    gmres               |    2     1      3  0.0s
    fgmres              |    2     1      3  0.0s
    bicgstab            |    2     1      3  0.0s
    cgs                 |    2     1      3  0.0s
    bilq                |    2     1      3  0.0s
    qmr                 |    2     1      3  0.0s
    usymlq              |    2     1      3  0.0s
    usymqr              |    2     1      3  0.0s
  Data Type: ComplexF64 |   54    25     79  3.2s
    bilqr               |    4     2      6  0.0s
    trilqr              |    6            6  0.0s
    tricg               |    2     2      4  0.9s
    trimr               |    2     1      3  2.1s
    gpmr                |    2     1      3  0.0s
    minres_qlp          |    2     1      3  0.0s
    symmlq              |    2     1      3  0.0s
    cg                  |    2     1      3  0.0s
    cr                  |    2     1      3  0.0s
    car                 |    2     1      3  0.0s
    cg_lanczos          |    2     1      3  0.0s
    minres              |    2     1      3  0.0s
    minares             |    2     1      3  0.0s
    diom                |    2     1      3  0.0s
    dqgmres             |    2     1      3  0.0s
    fom                 |    2     1      3  0.0s
    gmres               |    2     1      3  0.0s
    fgmres              |    2     1      3  0.0s
    bicgstab            |    2     1      3  0.0s
    cgs                 |    2     1      3  0.0s
    bilq                |    2     1      3  0.0s
    qmr                 |    2     1      3  0.0s
    usymlq              |    2     1      3  0.0s
    usymqr              |    2     1      3  0.0s
ERROR: LoadError: Some tests did not pass: 108 passed, 50 failed, 0 errored, 0 broken.
in expression starting at /home/alexis/Bureau/git/Krylov.jl/test/test_warm_start.jl:502