Wish: Similar <Tab> action than on the command line

[mklinga]

Hi! I think it would be quite nice to have loop possible options (buffers) like in commandline, instead of showing available buffers in a separate line.

So if I have buffers 'library.cpp' and 'library.h' I would have to type l for first, and l for second buffer.

This might raise an issue with autoselecting found buffer, though (as pressing completes an unique file name).