[RFA] new command to search memory

[Doug Evans]

Here's the revised "find" patch.  It includes all requested changes to date.

Could someone look at target.c:target_search_memory and make sure it's
DTRT regarding handling targetdebug and falling back on a default?
Given that we're not using inheritance here, the current code seems
like the right way to go, but ...

Ok to check in?

There's still an outstanding issue of supporting this in gdbmi.  I
split find_command into two parts so adding this to gdbmi should be
more straightforward.
And there's also an outstanding issue of if/how to support substring searches.
Both of these issues can wait I gather.
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