* Updated CMakeLists.txt to properly install the ISSI files thru CMake
* Update CMakeLists.txt to compile the src to generate filter.so
* Adjusted spaces on the code
* Update Stack.py
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.