fix offset for Serdes::des(int16_t &)
have scons take gcc=1 argument to use g++
compile Actor.cc and Message.cc
put Mbox, Topology, TopologyManager in src/engine/
compile engine/TopologyManager
main() calls TopologyManager
add creation of Mbox from TopologyManager--this causes linker error.
Creating bug and will work around for now.
Merge branch 'tmp' into mtravis

Conflicts:
	SConstruct
	src/engine/Actor.h
	src/engine/SConscript
	src/engine/TopologyManager.cc
	src/engine/global.h
	src/main.cc
Merging after detached head. This contains bug mentioned in
issue #26