Negmas

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- [tournament] Adding a string conversion to TournamentResults
- [sao] Adding SAOSingleAgreementController that is guaranteed to get
at most one agreement only.
- [helperrs] Supporting dumping csv files in dump/load
- [situated] making _type_name add the module name to the class name
before snake-casing it
- [situated] [bug] correcting cancellation_fraction implementation to
take into account non-negotiated contracts

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- [helpers] making add_records more robust to input
- [bugfix] Resolving a bug in creating graphs while running a tournament

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- [situated] Cancellation fraction and Agreement fraction now consider only
negotiated contracts

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- [situated] never fail for gif generation (just pass the exception)
- [CLI] Fixing a bug that prevented negmas tournament create from failing
gracefully when not given a scorer/assigner/world-config or world-generator.

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- [mechanism] triggering a negotiator_exception even on negotiator exceptions
- [situated] adding a count of exceptions per agent
- [situated] counting exceptions in negotiations as exceptions by the owner agent
- [mechanism] adding mechanism abortion

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- [situated] Adding the method call to World and using it always
when calling agents to count exceptions
- [situated] Adding n_*_exceptions to count exceptions happening in
agents, simulation and negotiations
- [tournaments] Adding n_*_exceptions to the tournament Results
structure (TournamentResults) reporting the number of exceptions
that happened during the tournament from different types
- [tournament] adding more details to tournament results and andding world_stats.csv to the saved data
- [situated] handling compact world running better:
- added a no_logs option to World that disables all logging including agent logging
- Corrected the tournament running functions to deal correctly with worlds with no logs
- [tournament] adding path to tournament results