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Fixed Precision (half, quarter) IO for the eigensolver
Now that we have quarter precision deflation fixed on power 9, it is possible to compute a deflation space in single precision and ten deflate in half or quarter precision. However, in its current state, the Lime IO interface can only read/write vectors in double or single precision. Given that device side memory is at a premium for DWF solves, it would be very beneficial to be able to read/write/store deflation spaces in fixed precision.