Simplify MI breakpoint setting

[Vladimir Prus]

I've noticed that mi_cmd_break_insert does some fairly
contrived logic which amounts to passing either 0 or 1
as the value of 'hardware' parameter to set_breakpoint.
Further, set_breakpoint appears to be trivial and useless
wrapper over break_command_really. This patch cleans that
up. Are breakpoint.{c,h} changes OK?

- Volodya
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