Correct time step calculation (including accel)

[luchete80]

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Total CPU time: 941.534
Step Count: 16993, Estimated remaining solve time: 197.404 hours
Calculation Times
Accel: 15%, Density: 8.8%, Stress: 27%, Thermal 17%
Energy: 9.2%, Contact: 4.8%, Nb: 5%, Update: 2.6%, Initial calcs: 5.7%,
Elapsed since last output: 0.23

Output No. 3 at 5e-05 has been generated
Current Time Step = 2.3e-09
Max plastic strain: 0.071in particle10456
Plastic Work 7.5e+02
Max Displacements (No Cont Surf): 3 [ 4.88305e-062.02231e-06 0 ]
Contact Force Sum 0, Reaction Sum 0
Contact Friction Work 0
External Forces Work 0.0881445
Int Energy: -1.01646, Kin Energy: -3.0647
Max, Min, Avg temps: 364.045, 20, 192.023

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Total CPU time: 30.0025
Step Count: 553, Estimated remaining solve time: 5.20083 hours
Calculation Times
Accel: 15%, Density: 9.1%, Stress: 27%, Thermal 17%
Energy: 8.7%, Contact: 4.5%, Nb: 5%, Update: 2.2%, Initial calcs: 5.3%,
Elapsed since last output: 0.21

Output No. 3 at 5e-05 has been generated
Current Time Step = 8.7e-08
Max plastic strain: 0.055in particle10456
Plastic Work 95
Max Displacements (No Cont Surf): 3 [ 4.87238e-062.05772e-06 0 ]
Contact Force Sum 25940.1, Reaction Sum -204.842
Contact Friction Work 0
External Forces Work 0.0875844
Int Energy: -0.792427, Kin Energy: -0.390287
Max, Min, Avg temps: 132.162, 20, 76.0809