Remove numerical fc symmetrization and make hiphive fully dependent on SymPy
In order to clean up the FC symmetrization part I suggest we simply remove the numerical based algorithm and make hiphive fully dependent on SymPy
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Since we don't even know if the numerical algorithm works currently and how unstable it is I think this is the best thing to do for now.
Later down the road when we look into #100 we can also look into possible removing the SymPy dependency.
Edited by Paul Erhart