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del deletes silently anything out of date.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del deletes everything silently (doesn't find anything that was not out of date), it returns DB_NOTFOUND

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Addresses #123

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Addresses #123
pget calls c_pget, get calls pget

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c_get will silently delete any out of date entries (relies on c_pget)
Replaced comment about unimplemented variable with #ifdef

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c_pget Will silently delete any entries that no longer have related primary keys,
or for which the primary key is out of data.

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