Fixed prompt not showing properly in dumb frotz

Prompt was not showing up until after user submitted a line, because prompts
do not end with a newline, which would trigger fflush(). Adding a fflush() of
stdout fixes this.
Fixed hard tab into proper spaces
Fixed help prompt not displaying properly

As with the other prompt, the help prompt needed a call to fflush
Merge pull request #2 from blanham/master

Fixed prompt not showing properly in dumb frotz