Health Secretary Robert F. Kennedy Jr. has been advising a holistic medical clinic in West Texas that has been distributing unproven alternative medicines during the deadly measles outbreak, Mother Jones reported Monday.   Local historian Tina Siemens and Dr. Ben Edwards of Veritas Wellness in Lubbock, Texas, have been working to distribute alternative medicines such as Vitamin C, cod liver oil, and inhaled steroid budesonide amid the growing outbreak. Siemens said they spoke with Kennedy last