added new functions to enable the cosimulaiton
changed the termnate() function to stop FFD safely
Deleted unused function
Deleted unused function
update the order
Reformatted return
Disable the nport checking for shoe box model
Enabled the data exchange when terminal() is true
function to enable safely stop FFD simulation
update due to the changes of funcitons
added a test for shoebox model
Added a warning when simulation time not a multiple of sampling time
Merge pull request #173 from zuowangda/ffd

Merge FFD to lbl repository