Throw pasha at characterize_cell and some other neat speedups

setup.py

@@ -75,6 +75,7 @@ setup(
     install_requires=[
         "iCalibrationDB @ git+ssh://git@git.xfel.eu:10022/detectors/cal_db_interactive.git@2.0.5",  # noqa
         "XFELDetectorAnalysis @ git+ssh://git@git.xfel.eu:10022/karaboDevices/pyDetLib.git@2.5.6-2.10.0#subdirectory=lib",  # noqa
+        "pasha @ git+https://github.com/European-XFEL/pasha.git@0.1.0",
         "Cython==0.29.21",
         "Jinja2==2.11.2",
         "astcheck==0.2.5",