Resolves #379, Resolves #378, Resolves #331, Resolves #323, Resolves #322, Resolves #321

• Refactored pandas implementation to improve performance Improve data summary performance #331
• Changed orientation of data summary such that columns of the dataset are in rows and the metrics are in the output columns
• Changed the ordering of metrics as suggested by Reorganize data summary #321
• Added # Unique values to list of metrics Add number of categorical (factor) levels to data summary #323
• Added option to display count metrics as percentages or as counts
• Added information about the dataframe shape and size as outputs Add total record count to data summary #322
• Added a display option for formatting floats Add parameter (default=True) to disable scientific notation in data summary #378 Add display formatting option with significant figures for data summary #379