HEADER/WAVE Wavelet

Gives information about a wavelet file and write them into keywords.
The following keywords are modified:
- OUTPUTI[1] = number of lines of the original image
- OUTPUTI[2] = number of columns of the original image
- OUTPUTI[3] = number of scales of the wavelet transform
- OUTPUTI[4] = algorithm number
- OUTPUTR[1] = Frequency cut-off
- OUT_A = PYR, CUB or IMA
- PYR if it is pyramidal algorithm.
- CUB if there is no reduction of the sampling.
- IMA if the wavelet transform has the same size as the original image.