fix vpitest
refine Makefiles
IReadableSignal -> ISignal
adding test2. for memory DUT test. needs posedge func
modify ISignal::readvec() -> readv(), add readi(), readu() readb()
add stop_iteration::except_msg when catch exception from body()
print Abort message, when a Process abort by throw exception
modify ProcessManagerImpl::raise() not to call schedule() if raise() running.
add posedge()
bix Makefile.vcs