[commit/mi] Simplify MI error handling

[Andrew Cagney]

Hello,

This patch modifies the gdb.h interfaces so that they explicitly return 
the error message in addition to the status (why it didn't do that from 
day one I don't know).

With that in place it becomes possible to simplify the MI's error code 
(it was handling MI and GDB errors very differently) so that it uses a 
single mechanism.  Ya!

committed,
Andrew

(What was happening was evil.  It was trusting that error_last_message 
hung around for longer then the next catch exception call :-()
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