Add ability to stop the search.
Add ability to stop the search.

yantrabuddhi/atomspace,cosmoharrigan/atomspace,inflector/atomspace,ceefour/atomspace,inflector/atomspace,rodsol/atomspace,misgeatgit/atomspace,inflector/atomspace,cosmoharrigan/atomspace,williampma/atomspace,rTreutlein/atomspace,cosmoharrigan/atomspace,yantrabuddhi/atomspace,yantrabuddhi/atomspace,rTreutlein/atomspace,inflector/atomspace,AmeBel/atomspace,misgeatgit/atomspace,AmeBel/atomspace,cosmoharrigan/atomspace,ArvinPan/atomspace,ceefour/atomspace,ArvinPan/atomspace,inflector/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,yantrabuddhi/atomspace,rodsol/atomspace,AmeBel/atomspace,ArvinPan/atomspace,rodsol/atomspace,williampma/atomspace,AmeBel/atomspace,rTreutlein/atomspace,rTreutlein/atomspace,williampma/atomspace,ceefour/atomspace,williampma/atomspace,misgeatgit/atomspace,AmeBel/atomspace,misgeatgit/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,ceefour/atomspace,rodsol/atomspace