add .readthedocs and other conveniences

core/group.py

 """
-Class to group multiple positions into one using one of several criteria.
+Class to group multiple positions into one using one different available criteria.
 """
 
 from pathlib import Path
@@ -9,7 +9,7 @@ import h5py
 import pandas as pd
 
 from agora.io.bridge import groupsort
-from postprocessor.core.io.signal import Signal
+from agora.io.signal import Signal
 
 from postprocessor.core.abc import ParametersABC, ProcessABC
 

core/multisignal/__init__.py

+"""
+Collection of processes that work on multiple signals.
+"""

core/report.py

 #!/usr/bin/env python3
 """
-System that produce a report summarising the results of an experiment.
+Automatic summarissed report to condense results of an experiment.
 It should NOT contain text beyond labels and titles.
 The most efficient way to communicate information is (inteligently) colour-coded figures and tables.