If you compile with:
DEBUG=true rake build
then all the commands get a --debug flag as an option which will make
the server dump crazy amounts of data to stderr.
All parameters now have switches. The one gotcha is the parameter which
was overloaded - s_length_or_filename to params_readwrite - is only
pretending to be a length at the moment. If you pass a filename it'll
still work, but the help messages don't mention that. I'll split the
parameter into two in a later commit.
