Doc cleanup before starting on version 0.5
refactor pastEnd to endBefore, and start to startOn
Easy refactorings done. Starting harder ones.
About to start major renaming and refactoring
OLAP calculates fieldNam_values but no other metrics yet
olapCalculator works with decent tests
all tests and doctests pass. About to start converting olap to a Class
OLAP working. About to refactor count and sumSquares
Incremental TimeInStateCalculator working, tested, documented
Doc cleanup