Added new tests to the testing framework.

Added the ability to remove null columns from the export via the collapse parameter.
Added the ability to generate a csv of just the top level games information and exclude the moves file.
Add the ability to configure the queue size of the blocking queue that is used to generate the moves file for each game concurrently as the process processes each game in the pgn file.
Minor code enhancements throughout

Added basic tests to check content is ok. Fixed issue when file can't…

… be opened because the encoding is missing. Fixed the value error message when python-chess tries to parse an invalid move.

Added missing requirements

Added functionality to read the csv files into pandas dataframes from…

… the result object.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.

Fixed issue with 'BlackElo' not being in the PGN file. Added further …

…tests to check Basic formats are handled by the library.