* Added non-interactive (external commands) support. The BeOS
implementation needs some more work; well, the whole FS shell will
probably have build issues on BeOS ATM.
* Added reasonably complete argument processing in main(). Options are
similar to the old FS shell.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20894 a95241bf-73f2-0310-859d-f6bbb57e9c96
