Verify constellation changes are taken care of

[7andahalf]

https://github.com/aerospaceresearch/DirectDemod/blob/0929526c0f931d182114c4ea738dcc0cfc933001/directdemod/decode_meteorm2.py#L291

The PLL may go out of sync and/or may rotate the constellation or flip it etc. This also changes the output bitstream. Even if this happens, we must ensure that the syncs are detected.

To ensure that, all possible "needles" or "syncs" have to be initialized and used for correlation. The purpose of this issue is to just verify that all possibilities have been considered.