lib/zodb: Add patch to ZODB.Connection to support callback on connection DB view change
Wendelin.core 2 will need to hook into when client ZODB.Connection changes its database view and readjust WCFS-level client connection accordingly. ZODB.Connection can change its view on either connection reopen, or even without reopen on start of new transaction. This patch implements ZODB.Connection.onResyncCallback for ZODB5 only. ZODB4 and ZODB3 support is TODO.
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