Add missing file

Fix #1812 CSV files are no longer imported correctly when double quotes inside strings are delimited with backslashes

Fix #1788 GephiFormatException: Gephi failed saving the project. Make sure no null names are used from old project files.

Go back to old maven javadoc plugin, it does not respect repositories section when looking for dependencies.

Spreadsheet importer detail so usage from toolkit will be easier and automatic as before for all CSV file types.