Commandline parameter for shell scripting support

[crlf0710]

Wonder if it is possible or appropriate to add a commandline parameter just like SBCL's "--script" or ECL's "-shell" switch. Maybe it will accept the pathname of a file to skip the #! line ,load, execute and quit. Any arguments following that are not processed and collected into CCL:*UNPROCESSED-COMMAND-LINE-ARGUMENTS*, just like what "--" did. This can be useful, and I don't see it will break any compatibility.