io.h not in API

[eubgus]

I just tried to compile some code that was working with an old version against the head revision, and found that some stuff had disappeared from dir.h... it seems to have partly been replaced by stuff now in io.h/io.cpp, but io.h is not in include/API/lite

My question (before I go filing an issue) is: Was that intentional (meaning we should not rely on your io functions, and supply our own)? or is it just an oversight?