* Fix burst loading in estimateAzimuthMisreg.py
Within the for loop that starts at line 82, looping through range(minBurst, maxBurst) misses the burst with the maximum burst number. In cases where only one burst in a swath is used, the script fails at line 90 when .getWidth() is called on an empty xml. This issue can be fixed by adding the line maxBurst = maxBurst + 1
* Fix burst loading in estimateRangeMisreg.py
Similar to estimateAzimuthMisreg.py, calling range(minBurst,maxBurst) at line 185 will lead to an empty list and the some bursts not being loaded unless line 181 is changed from maxBurst = maxBurst - 1 to maxBurst = maxBurst +1
+ dem.py: replace filename in xml file with abspath after geoid to ellipsoid correction
+ update README.md files in contrib/stack/*Stack, as fixImageXml.py is not needed anymore
+ fixImageXml: use native argparse mutually exclusive group for --full/--base options to replace checking with own code