IR module

$Id$

  This module provides the IR motion detector sensor functionality. 
Ir provides just interface to ADC. IrDetect module provides the detection 
functionality, AttrIrDetect registeres and attribute so that this 
functionality may be used by TinyDB. IrDetectProbe is an application 
that tests this functionality.
  Module was tested with mica2dot mote only.
  
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