Create new AF_UNIX based network simulator
Use simulator for existing msp tests
Add msp test over unreliable link
Overhaul Makefile and header files

Make .o files in separate subdirectories for servald and library
Factor struct __sourceloc and __WHENCE__ from "log.h" into "whence.h"
Factor sid_t etc from "serval.h" into "serval_types.h"
Factor rhizome_bid_t etc from "rhizome.h" into "rhizome_types.h"
Do not include "serval.h" in library sources
Add log_stderr.c and logMessage.c for stand-alone executables
Merge network simulator into development
Fix a faulty MSP test