Clean up float-contagion stuff; use it in Carlson routines.
o FLOAT-CONTAGION now only returns the real type, not a complex type. o Add APPLY-CONTAGION to make the specified conversion. This handle complex numbers and makes the components have the specified precision. o Change uses of contagion stuff to use APPLY-CONTAGION. o Use the contagion stuff in CARLSON-RD and CARLSON-RF.
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