Add possibility to save to CSV format (and some fixes)
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Users can now save the tweets to a CSV-format, by using the command line arguments "-c" or "--csv"
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The default value of begindate is set to 2006-03-21. The previous value (2017-01-01)
was chosen arbitrarily and leaded to questions why not all tweets were retrieved. -
By using linspace() instead of range() to divide the number of days into
the number of parallel processes, edge cases ( p = 1 ) now also work fine.