Allow nested rtxn from wtxn #3
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In this PR, we accept nested read-only transactions and no longer count them to accept more than one. We free/close the child transactions only once the last one has been dropped.
We use atomics to implement a reference-counted system that correctly drops the read transactions and the pghead only once. This is not C99 but C11-compatible.
Warning
We found a memory leak in this PR. We need to take time to investigate the matter and fix it.