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Fixed a few bugs with concurrent operation of internal_append, as well as
enabled the spawning of multiple empty buffers while merges are currently
active.
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Add empty buffer now supports a CAS-like operation, where it will only
add a buffer if the currently active one is still the same as when the
decision to add a buffer was made. This is to support adding new buffers
on insert outside of the merge-lock, so that multiple concurrent threads
cannot add multiple new empty buffers.
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When an epoch is created using the constructor Epoch(Structure, Buffer),
it will call take_reference() on both.
This was necessary to ensure that the destructor doesn't fail, as it
releases references and fails if the refcnt is 0. It releases the user
of the object from the burden of manually taking references in this
situation.
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Instead of busy waiting on the active job count, a condition variable is
now used to wait for all active jobs to finish before freeing an epoch's
resources.
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I started moving over to an explicit Epoch based system, which has
necessitated a ton of changes throughout the code base. This will
ultimately allow for a much cleaner set of abstractions for managing
concurrency.
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