The ENDFtk tree Section object now contains its own content string (previously the Tape object contained the entire content and the underlying Material, File and Section had iterators into the Tape content). This was done to allow for editing existing ENDF files by allowing insertion, replacement and removal of individual Material, File and Section objects from a Tape.
Added a function to update the directory in MF1 MT451
The basic ENDF records (TEXT, CONT, LIST, TAB1, TAB2, etc.) now have a python interface as well
Duplicate MEND, FEND and SEND records are now ignored (a warning message will be printed when this happens)
Full MF23, MF26, MF27 and MF28 capabilities for photoatomic and electron data
Full MF33 cross section covariance and MF34 angular distribution covariance capability
New features: