`find` can be a time consuming routine when it broadcasts for devices
and there are a lot of them in your network. We therefore have to
release the GIL before calling into find because otherwise the GIL
would be locked until `find` returns.
- Boost >= 1.58
- CMake >= 3.5.1
- gcc >= 5.4.0
- Clang >= 3.8, AppleClang >= 600
- Python >= 3.5 (Py2k no longer supported)
- Numpy >= 1.11
- C++14 for lib, include may now use C++11 constructs.
- Because there is no more code requiring C++03 syntax, we remove the
include-specific clang-format file
- Makes use of more modern find_package(Python2/3) if available
- Moves almost all Python-related code to UHDPython.cmake
- ENABLE_PYTHON3 is no longer necessary
