This is one of those little chores in managing a long-lived C++
project: standard C headers like stdio.h and math.h now have their own
place in the C++ standard as resp. cstdio, cmath, and so on. In this
branch the #include names are updated for the biconcor/ subdirectory.
C++11 adds cstdint, but to support compilation with the previous
standard, that change is left for later.
The example in contrib works, as does the one in biconcor.
The examples in lm and moses don't work at the moment,
but checking them in anyway as a starting point
for any potential work on them next week during the
MT Marathon.
