Issue with slack mode

[SurabhiSimha]

I’ve attached a file that has a pdf explaining the issue and the solution. I couldn't attach the .m file with the solution. Here's a brief description of the solution. In the function implement_time_step in the muscle class,

1. commented out lines 80 to 83
   Slack mode in MATMyoSim02.pdf
   Slack mode in MATMyoSim02.pdf

2. added a comment describing my commenting out in lines 78 and 79

3. moved the commented-out lines to line 99 to 102.

4. Made a small change to the input values to implement_step_time in the half-sarcomere class as shown here:
   obj.hs(1).implement_time_step(time_step, adjustment, Ca_value, m_props)
   uses “adjustment” as the harcomere length change as opposed to obj.hs(1).implement_time_step(time_step, 0, Ca_value, m_props)
   which was originally happening in line 80. By calling it with “adjustment”, it also runs move_cb_distribution in implement_time_step in the half_sarcomere class (line 11).

5. commented out line 103 since this already calls move_cb_distribution