Negmas

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- Avoiding backward incompatibility issue in version 0.2.23 by adding INVALID_UTILITY back to both utilities
and apps.scml.common

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- documentation update
- unifying the INVALID_UTILITY value used by all agents/negotiators to be float("-inf")
- Added reserved_value parameter to GreedyFactoryManager that allows for control of the reserved value used
in all its ufuns.
- enable mechanism plotting without history and improving plotting visibility
- shortening negotiator names
- printing the average number of negotiation rounds in negmas scml command
- taking care of negotiation timeout possibility in SCML simulations

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- adding avoid_free_sales parameter to NegotiatorUtility to disable checks for zero price contracts
- adding an optional parameter "partner" to _create_annotation method to create correct contract annotations
when response_to_negotiation_request is called
- Avoiding unnecessary assertion in insurance company evaluate method
- passing a copy of CFPs to on_new_cfp and on_cfp_removal methods to avoid modifications to them by agents.

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- logging name instead of ID in different debug log messages (CFP publication, rejection to negotiate)
- bug fix that caused GreedyFactoryManagers to reject valid negotiations

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- logging CFPs
- defaulting to buying insurance in negmas scml
- bug resolution related to recently added ability to use LinearUtilityFunction created by a dict with tuple
outcomes
- Adding force_numeric to lead_genius_*

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- minor updates