cleanup and add docs

core/functions/__init__.py

 #!/usr/bin/env python3
+
+"""
+Collection of non-process functions. These are usually called by processes but not fetched automatically..
+"""

core/functions/test_hdf.py

-#!/usr/bin/env python3
-# c=CellsHDF.from_source("/home/alan/Documents/sync_docs/PhD/tmp/DO6MS2_003store.h5")
-import h5py
-from core.cells import Cells
-import pandas as pd
-
-# f = h5py.File("/home/alan/Documents/sync_docs/PhD/tmp/DO6MS2_003store.h5")
-fname = "/shared_libs/pipeline-core/scripts/data/20191026_ss_experiments_01/DO6MS2_003store.h5"
-f = h5py.File(fname)
-tracks = f["/extraction/general/None/area"][()]
-cell = Cells.from_source(fname)
-from postprocessor.core.processes.picker import Picker, PickerParameters
-
-picker = Picker(cells=cell, parameters=PickerParameters.default())
-
-from postprocessor.core.processor import PostProcessor, PostProParameters
-
-pp = PostProcessor(filename=fname, parameters=PostProParameters.default())
-pp.run()