NiftyPET/NIPET: nipet v2.0.0 stable

Features support Python3.6+ (#15 <- #14) add customisable PSF resolution modelling kernel (#31, #25) support all of: scanner measured, manual Gaussian, and custom separable PSF kernels prevent floating point division errors (#25, #23) improve classify_input add optional directory recursion (#24) basic pathlib support fix & upgrade logging (#9, #5) provide & use new LOG_FORMAT fix & update dependencies fix & update example notebook (#13, #9) fix nonexistent paths (#22) add progressbar (#4) Installation/build framework support Python3.6+ (#15 <- #14) drop Python 2 compatibility drop py<=3.5 which are unsupported by ninst<-miutil[cuda]<-pynvml and no longer receive security fixes anyway add tests (#29) including helpers for downloading data add cloud testing add coverage reporting fix warnings (#28, #27) update CMake policies & fix Python deprecation warnings improve CUDA code (#28, #27) better error handling de-deuplication better linking fix compiler warnings remove unneeded variables put > stream[%d] messages on one line only create poisson distribution if needed (#19) fix conda install allow non-interactive installation (#17, #9) allow setting PATHTOOLS & HMUDIR from env vars new build framework (#30, #27) cmake/cuda build overhaul move metadata setup.py -> setup.cfg allows pip install nipet on a completely clean system (no numpy, no miutil[cuda], no -e, no --no-binary :all:) replace dinf module => miutil.cuinfo (#26 <- #18) rely on numpy, miutil[cuda], ninst, scikit-build, cmake>=3.18, ninja all auto-installed at setup-time! get rid of cudasetup.py get rid of install_tools.py get rid of resources.py use new CMAKE_CUDA_ARCHITECTURES policy use new project LANGUAGES specification support python setup.py clean basic code tidy (particularly import ordering) update .gitignore, README.rst badges (#9, #4