 Usage:  v = readvalue(ValueNames, defaults)   
 
 Input:

  ValueNames             a vector of strings to explain the values 
                         
  defaults               a vector of default values 
                         
                         
 Output:

  v                      the vector of values entered by the user 
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
