Doc note.
Update package description.
Environment.put() should return txn.put()'s return value

When overwrite=False, then Transaction.put return code is significant.
Update docstring for faux type used for _invalidate()
Update docstring again.
Sub-databases -> "named databases", like lmdb.h.
Initial version of Cursor.replace().
Remove some indirection in replace() docs/code.
Handle db=None.
C replace() implementations.
Add get+put vs replace to dirtybench.
Delete ancient MANIFEST.in cruft.
Implementation notes.
Shorten titles.
Englishinate.
Update stats code.
Define USING_MEMSINK.
CPython fix for #43.

Track mutation count for (visible) Transaction objects modified using
Cursor/Transaction methods. If mutation occurs, then
Cursor.key/value/item must MDB_GET_CURRENT before touching cached
MDB_vals.
CFFI fix for #43. Closes #43.
bf0e97aa0e9 @ git://gitorious.org/mdb/mdb.git

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