osqp-eigen not compatible with osqp 0.6.0

[GiulioRomualdi]

osqp-eigen is not compatible with the latest version of osqp (0.6.0) https://github.com/oxfordcontrol/osqp/pull/170 The incompatibility is caused by the following two commits:

1. https://github.com/oxfordcontrol/osqp/commit/78d11351555d6d4b0445a8d65d1066bb47df3b00 osqp_setup now returns an exit flag instead of OSQPWorkspace*

   diff --git a/include/osqp.h b/include/osqp.h
   index 4a25388f..8ced8cac 100644
   --- a/include/osqp.h
   +++ b/include/osqp.h
   @@ -50,12 +50,12 @@ void osqp_set_default_settings(OSQPSettings *settings);
   * NB: This is the only function that allocates dynamic memory and is not used
   *during code generation
   *
   + * @param  work         Solver workspace
   * @param  data         Problem data
   * @param  settings     Solver settings
   - * @return              Solver environment
   + * @return              Exitflag for errors (0 if no errors)
   */
   -OSQPWorkspace* osqp_setup(const OSQPData *data,
   -                          OSQPSettings   *settings);
   +c_int osqp_setup(OSQPWorkspace** work, const OSQPData* data, const OSQPSettings* settings);
   
   # endif // #ifndef EMBEDDED

2. https://github.com/oxfordcontrol/osqp/pull/170/commits/06678c794eaf78afd448414e6ad1c8fb5b9b3ab0 osqp now accepts only upper triangular Hessian matrices

   diff --git a/src/osqp.c b/src/osqp.c
   index c5508f0f..1d4ef186 100644
   --- a/src/osqp.c
   +++ b/src/osqp.c
   @@ -111,7 +111,7 @@ c_int osqp_setup(OSQPWorkspace** work, const OSQPData *data, const OSQPSettings
   (*work)->data    = c_malloc(sizeof(OSQPData));
   (*work)->data->n = data->n;                    // Number of variables
   (*work)->data->m = data->m;                    // Number of linear constraints
   -  (*work)->data->P = csc_to_triu(data->P);       // Cost function matrix
   +  (*work)->data->P = copy_csc_mat(data->P);      // Cost function matrix
   (*work)->data->q = vec_copy(data->q, data->n); // Linear part of cost function
   (*work)->data->A = copy_csc_mat(data->A);      // Linear constraints matrix
   (*work)->data->l = vec_copy(data->l, data->m); // Lower bounds on constraints