 Usage:  v = filltime (t, length {, gran {, step}})  
 
 Input:

  t                      scalar timepoint 
                         
  length                 scalar number of elements in u 
                         
  gran                   granularity 
                         
  step                   scalar difference between two timepoints 
                         
 Output:

  u                      length x 1 time vector 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
