Some module dependency cleanup.

Move wman.* from onlinehelp/ to commandline/, since they depend on stuff
from commandline, and are not used by anything else than statutil.cpp
for command-line stuff.  Also, don't let exceptions from write_man()
propagate into C code potentially calling parse_common_args().

Move some additional file I/O stuff into trxio.c from statutil.cpp,
removing otherwise unnecessary dependencies to fileio.

Change-Id: I43ededf3c729239cd0e6bd8ddaf97386747c4363