The Tab completion seems unintuitive

[certik]

Some issues:

• It will alternate between what I wrote and a completion. Instead, when I hit Tab, it should complete the longest common completion of all alternatives, then stop. Another Tab hit should show the possible continuations.
• When there is just one directory, typing one letter and Tab should finish it, and another tab should show what's in the subdirectory. Instead it will cycle back to my one letter suggestion.