@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.
This commit adds experimental CMake build support for ISCE2.
The only changes involved should be adding CMakeLists.txt files.
All current source files, headers, and other functionality, including
the existing SCons build system, should be unaffected.
Some functionality is still a work-in-progress.
These should all be marked as TODO in the CMakeLists.txt files.
`grep TODO **.txt`
Please read CMakeLists.txt and .cmake/*.cmake for more info.
Vincent Schut
Paul A Rosen
Ryan Burns
Simon Kraatz
Ryan Burns
Microwave Remote Sensing Laboratory
Eric Gurrola