added multiplicative fit to pymc fitting (all hidden away in PCA_tools.... should move that around)
added multiplicative fit to pymc fitting (all hidden away in PCA_tools.... should move that around)


git-svn-id: 4511b3d811903a91403bf66535cdd426db6c410e@490 7a03b35a-38c0-11de-8fef-1f5ae417a2df

keflavich/agpy,astocko/agpy,keflavich/agpy,astocko/agpy,astocko/agpy,keflavich/agpy,keflavich/agpy,astocko/agpy