Automatically use hardware watchpoints

[Vladimir Prus]

Vladimir Prus wrote:

> 
> Hello!
> 
> At the moment, gdb is not very good at debugging applications in flash:
> - you must remember to use 'hbreak' and not 'break'
> - a number of commands (like "next") want to use breakpoints
>         internally. Since software breakpoints do no work, those commands
>         do no work either.
> 
> This patch makes insert_bp_location automatically decide what breakpoint
> type should be used if the target provides a memory map.

And here's a version of this patch that actually includes doc changes.

- Volodya

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