rename-buffer non courteous when buffer name is already in use

[Dan Jacobson]

Why can't it just prompt me for a different name instead of just the
'beep and excuse'  brush-off.

So "x" is in use.  Well prompt me for another choice and I'll say
"y".  Don't have me have to type the whole command over again.

I just want to pick a one letter string for later recall.

C-x b a <return> C-x b b <return> <escape> x r e n 
a m <tab> b <tab> <return> a <return>
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