Remove most of socket_perror usage.
Allow passing CXXFLAGS to build.FluffOS.
Fix crash when sending 0 length message through lpc socket.
Delete one more socket_perror().
Remove more obsolote macros, make DEBUG_MACRO always on.
Update changelog for FluffOS-3.0-alpha6
Merge pull request #121 from sunyc/master

Final changes to include in alpha6.