remove several 'ne' methods
Now inline default 'ne' methods
made Eq for package_id use more standard parameter names
auto merge of #8896 : lightcatcher/rust/default_eq_fix, r=thestinger

Summary:
-removed "ne" methods in libstd and librustpkg
-made default "ne" be inlined
-made one of the "eq" methods in librustpkg follow more standard parameter naming convention