+ plot the evolution of offset after each step to better check the changes by masking, filling and filtering operations.
+ plot both azimuth and range offset in one figure and move the plotting to the end after file writing
+ update file path in xml file so that script can work even if the files are moved.
+ convert SNR nan value to zero before used as the mask, to avoid warning message
+ add the following options to customize the plot
- add -v and --v-snr option to change the display range for offset and SNR
- add --figsize and --save option
+ suppress the DEBUG message from matplotlib
+ remove obsolete getShape() and resampleOffset()
+ update IML module import
+ adjust indentation
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