ENH: ThreadJob introduced

src/libloom/CMakeLists.txt

src/libloom/tasks/python.cpp

src/libloom/tasks/python.h

src/libloom/tasks/rawdatatasks.cpp

src/libloom/tasks/rawdatatasks.h

src/libloom/threadjob.cpp

src/libloom/threadjob.h

src/libloom/ttinstance.cpp

src/libloom/ttinstance.h

src/libloom/worker.cpp

tests/client/loomenv.py