#7 Add 'quiet' option for command line

[Martin Scharrer]

Please add a 'quiet' option (e.g. '-q') for command
line, which disables all output to the terminal (no
stdout (if -so not used), no stderr).
Errors should only reported over the return value
in this mode.
This feature is necessary for proper use 7z in shell
scripts (mainly under Unix/Linux).

Example:
I use 7z under Linux in pipes:
$ sourceprog | 7z -q -si -so | destprog
reads data from 'sourceprog', 7z-compress it and
send it to 'destprog'. Very frequently used in shell
script. The normal output of 7z is nasty in thus a
situation.

[my space]

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p7zip is not a fork of the Windows 7-zip program.

The usefull option "-q" should be asked to Igor Pavlov
(http://sourceforge.net/forum/?group_id=14481)