If specified, DeleGate will run in foreground like -f and
log will be put on the control tty, not to LOGFILE
More detailed log than that
of -v can be got using -vv option. Similarly you can control the
detailness of log to be written into logfile by -vd, -vt or -vs options;
-vd makes logs detailed with debug information whereas
-vt makes it terse and
-vs makes logging stop and be silent;
this option has similar effect with LOGFILE="".
Another option -va makes hidden log in the most detailed level (that of -vd)
which is output only when some kind of ABORT occurred to cause
-vu puts logging level back to usual one.