One of the tests found a bug in the logging.  (Logged key twice instead of key,data pair).  Addresses #27.

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 Make txn->abort work without bombing out for {{{test_txn_abort5}}} one case. Fixes #431.
 Start writing {{{test_txn_abort6}}}.   Addresses #443.
 Try to write a test for #399 and #400, but haven't managed to reproduce the problem.  Addresses #399, #400.
 Write a test for #332.  Addresses #332.


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Fixed test_00010_parameter_errors.c

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Restore comments in lock tree.

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Refactored error handling to work with C++ API.
Modify Makefile to avoid repeating all tests.

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Propagate refactored error handling to C++ API.

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Port Makefile to OSX. Reduce non-verbose output. Added completion echo for targets.

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Adds new functions for ephemeral locking and error handling.

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Separates out error handling and ephemeral locking. 
However, it fails a few tests.

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Partial implementation of nested transactions for locking purposes.
The actual txn (child/grandchild/etc) does all the work,
but for locking purposes we only use the parent (oldest ancestor).
This should work as expected (with possibly some extra lock overhead)
as long as no node has two active (non-aborted non-committed) children
simultaneously.

If a node has two children, they are supposed to be able to conflict
with each other (and deadlock/etc).  We are not providing this
conflict behavior between siblings.

We do support arbitrarily deep nested txns, so long as it is
a linked list instead of a general tree.

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