Update test files for ^@ change (NOT LuaTeX)
tree8fac374a62fabfdff49cf6155e4f7a07ce74b64f
drwxr-xr-x - latex2e-20150101
drwxr-xr-x - latex2e-20151001
drwxr-xr-x - latex2e-20160201
drwxr-xr-x - latex2e-20160331
drwxr-xr-x - latex2e-20170101
drwxr-xr-x - trunk