Converting old acceleration settings to latest Marlin

#define HOMING_FEEDRATE {25*60, 25*60, 4*60, 0}  // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT   {86.6379,85.6822,2560,159.882}  // default steps per unit for Ultimaker
#define DEFAULT_MAX_FEEDRATE          {300, 300, 5, 25}    // (mm/sec)
#define DEFAULT_MAX_ACCELERATION      {1000,1000,50,250}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.

#define DEFAULT_ACCELERATION          1000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION  250    // E acceleration in mm/s^2 for retracts
#define DEFAULT_TRAVEL_ACCELERATION   500    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves

#ifdef RAMP_ACCELERATION
// X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
float max_start_speed_units_per_second[] = {25.0,25.0,0.2,10.0};
long max_acceleration_units_per_sq_second[] = {1000,1000,50,250}; // X, Y, Z and E max acceleration in mm/s^2 for printing moves or retracts
long max_travel_acceleration_units_per_sq_second[] = {500,500,50,500}; // X, Y, Z max acceleration in mm/s^2 for travel moves
#endif