make && ./test_db_cursor.tdb && ./test_db_cursor.tdb --more
Addresses #162.


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Simplified version has trouble if we change the line 402 to a 3 or a 2 then its bad or good to do:
 make && ./test_db_cursor.tdb 1 && ./test_db_cursor.tdb 1 --more


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mixing toku_malloc and malloc is not a problem.  At least with BUFFERED_MALLOC not defined.  Added a test, and a {{{#error}}} inside {{{memory.c}}}.  Fixes #161.

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and pruning stale records in secondary databases.
Closes #144
Closes #158
Fixed bug where we modify key or pkey or data if we return errors and
we really just pruned stale records.

Added test to verify we have no memory leaks caused by these issues.

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There was a bug in brt.c which checked to see if the number of pinned pages is zero at the beginning of a lookup.  With an open cursor, that doesn't have to be true.

Fixes #64, #141.



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Test making certain we free any memory given to us that is flagged DB_DBT_APPMALLOC

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Closes #66

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DB->pget uses dbc->c_pget, but needs to convert DB_KEYEMPTY to DB_NOTFOUND.

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DB->del deletes silently anything out of date.
If DB->del deletes everything silently (doesn't find anything that was not out of date), it returns DB_NOTFOUND

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