* Don't execute a command anymore, if the given prefix is ambiguous.
* Added tab completion for commands.
* Added on-the-fly help while typing a command line. It is triggered
by pressing tab at a position after the space following the command.
It is implemented by calling the command with argument "--help", which
doesn't work yet with most commands, but some already print their
usage in this case.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23521 a95241bf-73f2-0310-859d-f6bbb57e9c96
Ingo Weinhold