By: Jessica Goddard Frederick Wiseman’s Ex Libris: The New York Public Library is a slow and detailed documentary about the vast institution of the New York Public Library (not to be confused with its famous headquarters in Midtown Manhattan).  The film focuses on the NYPL’s many branches and services and functions, offering long samples of footage of what goes on from day-to-day in different branches, ranging from the micro to the macro.  Famous speakers and…