Low-Dose or High-Dose Conditioning Followed by Peripheral Blood Stem Cell Transplant in Treating Patients With Myelodysplastic Syndrome or Acute Myelogenous Leukemia

acute myeloid leukemia with multilineage dysplasia following myelodysplastic syndrome, acute myeloid leukemia/transient myeloproliferative disorder, adult acute myeloid leukemia in remission, adult acute myeloid leukemia with 11q23 (mll) abnormalities, adult acute myeloid leukemia with del(5q), adult acute myeloid leukemia with inv(16)(p13;q22), adult acute myeloid leukemia with t(15;17)(q22;q12), adult acute myeloid leukemia with t(16;16)(p13;q22), adult acute myeloid leukemia with t(8;21)(q22;q22), childhood acute myeloid leukemia in remission, childhood myelodysplastic syndromes, de novo myelodysplastic syndromes