 Usage:  x = invdwt (y, l, h)  
 
 Input:

  y                      n x 1 vector, coefficients of a wavelet transform using dwt, 
                         where n has a power of 2 
                         
  l                      integer, number of father wavelet coefficients 
                         
  h                      m x 1 vector, wavelet basis 
                         
 Output:

  x                      n x 1 vector, 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
