Ticket #3 not yet finished, blocked by #7



Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

If we get told that there is no more input for a block
we can return error and avoid waiting indefinitely.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Also: modify a bit the API for 32 bits.
The user should not expect RQ to manage more memory
than the 32 bit machine can handle. This means that
some methods should work with and return size_t, not uint64_t

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

This way we don't need to sync on which algorithm
to use, as that would introduce locking.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Also, cleanup Cmake.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Groundwork started.
Started moving things to RFC6330.
Next steps will be cleanup & RaptorQ namespaces.

Meanwhile we need better file naming.

Supporting multiple versions of the same API
should be easier now.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>