#14 partial query messages are repeatedly forwarded

[Sam Madden]

motes forward query messages (query fragments) for
queries they have partial information about, even if
they have already forwarded a particular fragment.
this can lead to a single frament being forwarded
endlessly through the network, which is bad.

[Sam Madden]

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seems to have been fixed -- solutions:

- don't resend messages from mote id 0 unless they come
over the UART or are new
- use a bitmap in query request messages to list the fields
that the sender needs