Commits on Sep 5, 2019

1. Transaction._free drops more references, and Transaction.abort() is a… …

   … little safer.
   
   Specifically, free the manager and synchronizers, plus a few other
   dictionaries that could be arbitrary size and contain arbitrary data.
   
   And abort() always invokes _free() even in the case of exceptions.
   commit() still doesn't so that the synchronizers are available for the
   expected abort().
   
   But take care about when and how abort frees its manager: not only
   does this preserve backwards compatibility, but it lets it be
   safe to abort a transaction object more than once. A happy side-effect
   of only freeing the manager there is that synchronizers can access
   data they set in afterCompletion().
   
   From discussion in #82

   

   jamadden committed Sep 5, 2019
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