Multilevel indexing with .to_latex() method merges two index columns
using Release 0.10.1
using the .to_latex method on a multilevel frame (specifically using a pivot_table) merges the two index columns so that it does not render correctly in latex.    Looks like it is missing the & for blank cells in index.  and also an & for the columns.   Manually inserted those in output and it fixes problem
