* file_piece.cc used isnan() instead of std::isnan().
* Fdstream.h used close() but Windows doesn't have unistd.h.
Fixed Fdstream.h by using util::scoped_fd. Thanks Ken.
Add <cstdlib> include for srand()/rand(), and <unistd.h> for open() etc.
Include <unistd.h> on Windows if using MinGW. Disable MeteorScorer on
Windows, since it doesn't have fork() and pipe().
- Use forward declaration to reduce dependencies.
- Add "virtual" to the destructor of _fdstream class.
- Avoid using namespace std in header.
- We have already used in mert a lot, though. It should be fixed.
- Fix warnings "-Wreorder".
- Fix the usage of enum.
