* add unpack and prepare files for UAVSAR HDF5 files
* fix acq typo, expand stackStripMap to HDF5 UAVSAR
* remove comments from previous UAVSAR skeleton
* fix hard coded freq A, clarity on gdal format command
* stackStripMap.py: change numbering style to match with topsStack
* Stack.py: separate parallel processors in topo.py from runfiles
* stackSentinel.py: add a new argument for parallel processors in topo.py
* Stack.py: remove extra num_process for unpackStackReferenceSLC
* stackSentinel.py: tie numProcess4topo to numProcessif the first not specified
+ FilterAndCoherence: skip filtering if input filter strength <= 0 and use original phase for coherence estimation
+ Stack: do not add filt_ prefix to output file if input filter strength <= 0
@falkamelung noted a race condition in #106 due to non-atomic directory
checking followed by os.makedirs. This pattern exists in many places
in the codebase so I went ahead and replaced the rest of them.
The new exist_ok usage should be terser and more idiomatic.
+ convert README.txt to README.md
+ stackStripMap.py: group iono options in createParser()
- group all iono options in createParser() for more easily navigation in --help.
- fix typos in the descriptions for the script and --dem option.
expose the -f / --filter_strength option in the parser to user so that one is able to change the filtering strength. Default is setted as the hardwired value - 0.8, so previous setting won't be affected.