[phobos] Two questions about the use of libc in Phobos

[Lars Tandle Kyllingstad]

This is mostly out of curiosity, but also relevant for any future 
contributions to Phobos:

1. AFAIK, the full interface for the C standard library is in druntime, 
specifically the core.stdc package, with OS-dependent stuff in core.sys. 
  Yet, there still exists an std.c package in Phobos that contains more 
or less the same things, and which is used extensively throughout the 
rest of the library.  Is this intentional, or am I just seeing the 
relics of pre-druntime Phobos?

2. Phobos uses functions from the C standard library in favour of native 
D implementations in several places.  (In light of recent discussions, 
std.stdio.File comes quickly to mind.)  Is this just a way of getting 
things up and running quickly, with the intention of D-ifying things 
later, or is it considered a permanent solution?

-Lars