* The previous code did not handle the retry correctly

* Fix the extractor in error message

* Multiply the number of points per the number of elements

* Add a infoattr function to retrieve the information about attribute dimension.
* When we have a 1D spectrum, switch to GetAttBetweenDates
* Serve a Pandas DataFrame

Also:
* Add Date format on helps
* Avoid running minmaxmean function

* Add __init__.py in core (empty for now)
* Add a bash source script yo load Python3 env and add the directory to pyhton path
* Add a .gitignore
* Cut out some code in ArchiveExtractor.betweenDates to outside functions

* Uncapitalize attribute
* Log the extraction as an info

* retries 2 times before leaving with error

* It always gave the now-time at the moment of import...
* By letting the argument to None, it default to now

* It is now possible to pass a str with a log level
* If no logger is passed, we getLogger(__name__)
* A stream handler is added on the newly created logger, only if it doesnt have one already.