if extent not read-only, get instrusive warning

[LisaAlmarode]

If the rowan extent is not read-only, solo gives a warning message. Since there's a small pause - maybe half a second - from this point until the superdoits do all their processing and start printing, you see this and as you focus your eyes to read "WARNING", it seems to disappear since the actual help output scrolls it away.

It would be nice to suppress that warning during superdoit execution.

> ./simple.solo -h
[WARNING]: extent not read-only on filesystem, opening with exclusive lock: <path>
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USAGE simple.solo [--help | -h] [--debug | -D]

DESCRIPTION
  Evaluate the Smalltalk expression: 3+4 and return the result on stdout.

OPTIONS
  -h, --help                 display usage message
  -D, --debug                bring up topaz debugger in the event of a script error

EXAMPLES
  simple.solo --help
  simple.solo -h
  simple.solo --debug
  simple.solo -D
  simple.solo
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[LisaAlmarode]

filed as server bug 49923