Adding an implementation of lgamma for speed - #304
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…pp: removing linear optimization functions and using only the fdf
…unctions and only using the fdf. Reordered some local functions. Added include for radmeth_lgamma and now using that instead of gamma
…se the one in glibc is slow and I don't think we need all the branching, etc., which seemed to be pressuring icache
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The implementation in glibc on some systems seems quite slow, and we don't need as broad a lgamma anyway