PATCH: BufferedReader, DataInputStream merge

[Bryce McKinlay]

This patch merges BufferedReader with classpath. I've gone with the
libgcj implementations on the basis that the classpath one has known
bugs and libgcj's doesn't. I've also made several DataInputStream
methods more efficient and made skipBytes() work as it does in the JDK
1.3. Also, neither classpath nor libgcj correctly checked for a closed
stream in BufferedReader.

regards

  [ bryce ]