work around bug in importance index.
work around bug in importance index.

It appears that someone somewhere is removing atoms from the TLB,
but failing to remove them from the atom table.  This is causing
atoms to appear in the incoming set, even though they supposedly
don't exist any more. Ooops.

shujingke/opencog,gaapt/opencog,prateeksaxena2809/opencog,rohit12/atomspace,AmeBel/opencog,sanuj/opencog,misgeatgit/atomspace,Allend575/opencog,prateeksaxena2809/opencog,inflector/opencog,UIKit0/atomspace,AmeBel/opencog,eddiemonroe/opencog,virneo/atomspace,ArvinPan/opencog,virneo/atomspace,Selameab/opencog,virneo/opencog,jswiergo/atomspace,inflector/opencog,ArvinPan/atomspace,sanuj/opencog,rodsol/opencog,eddiemonroe/opencog,sanuj/opencog,AmeBel/opencog,Tiggels/opencog,yantrabuddhi/opencog,yantrabuddhi/opencog,inflector/opencog,printedheart/opencog,yantrabuddhi/opencog,Selameab/opencog,cosmoharrigan/opencog,roselleebarle04/opencog,ceefour/opencog,ArvinPan/atomspace,jswiergo/atomspace,andre-senna/opencog,cosmoharrigan/opencog,andre-senna/opencog,ceefour/opencog,kinoc/opencog,anitzkin/opencog,UIKit0/atomspace,sumitsourabh/opencog,Selameab/atomspace,roselleebarle04/opencog,inflector/opencog,Allend575/opencog,eddiemonroe/atomspace,TheNameIsNigel/opencog,williampma/opencog,prateeksaxena2809/opencog,virneo/opencog,Selameab/atomspace,cosmoharrigan/atomspace,gavrieltal/opencog,virneo/opencog,roselleebarle04/opencog,rTreutlein/atomspace,roselleebarle04/opencog,ceefour/opencog,Tiggels/opencog,cosmoharrigan/atomspace,rTreutlein/atomspace,inflector/atomspace,Selameab/atomspace,rohit12/opencog,williampma/opencog,jlegendary/opencog,shujingke/opencog,tim777z/opencog,TheNameIsNigel/opencog,ArvinPan/atomspace,virneo/opencog,rodsol/opencog,tim777z/opencog,printedheart/atomspace,cosmoharrigan/atomspace,Selameab/opencog,misgeatgit/opencog,jswiergo/atomspace,ruiting/opencog,misgeatgit/opencog,gaapt/opencog,misgeatgit/atomspace,yantrabuddhi/atomspace,eddiemonroe/opencog,MarcosPividori/atomspace,ruiting/opencog,williampma/atomspace,iAMr00t/opencog,jswiergo/atomspace,Selameab/opencog,AmeBel/atomspace,UIKit0/atomspace,ArvinPan/opencog,sumitsourabh/opencog,rohit12/opencog,virneo/atomspace,iAMr00t/opencog,williampma/opencog,ruiting/opencog,kinoc/opencog,rohit12/atomspace,yantrabuddhi/atomspace,williampma/opencog,rodsol/opencog,Tiggels/opencog,ArvinPan/opencog,kim135797531/opencog,williampma/atomspace,misgeatgit/atomspace,tim777z/opencog,inflector/atomspace,rodsol/opencog,rodsol/opencog,rodsol/atomspace,ArvinPan/atomspace,yantrabuddhi/atomspace,prateeksaxena2809/opencog,kim135797531/opencog,iAMr00t/opencog,AmeBel/atomspace,AmeBel/opencog,Allend575/opencog,williampma/opencog,Allend575/opencog,MarcosPividori/atomspace,tim777z/opencog,cosmoharrigan/opencog,yantrabuddhi/opencog,sumitsourabh/opencog,zhaozengguang/opencog,Allend575/opencog,UIKit0/atomspace,Tiggels/opencog,kim135797531/opencog,ceefour/atomspace,iAMr00t/opencog,andre-senna/opencog,inflector/atomspace,inflector/opencog,eddiemonroe/atomspace,shujingke/opencog,kinoc/opencog,Allend575/opencog,cosmoharrigan/opencog,virneo/opencog,anitzkin/opencog,gaapt/opencog,gaapt/opencog,ceefour/atomspace,anitzkin/opencog,cosmoharrigan/opencog,jlegendary/opencog,rodsol/atomspace,misgeatgit/opencog,anitzkin/opencog,yantrabuddhi/atomspace,eddiemonroe/atomspace,misgeatgit/opencog,printedheart/opencog,inflector/opencog,TheNameIsNigel/opencog,ruiting/opencog,roselleebarle04/opencog,ceefour/opencog,kim135797531/opencog,sanuj/opencog,anitzkin/opencog,printedheart/opencog,inflector/opencog,ceefour/opencog,gaapt/opencog,rohit12/atomspace,prateeksaxena2809/opencog,gavrieltal/opencog,zhaozengguang/opencog,misgeatgit/opencog,rTreutlein/atomspace,rohit12/opencog,ArvinPan/opencog,ceefour/atomspace,ArvinPan/opencog,anitzkin/opencog,prateeksaxena2809/opencog,printedheart/atomspace,AmeBel/atomspace,Tiggels/opencog,gavrieltal/opencog,virneo/atomspace,cosmoharrigan/opencog,misgeatgit/atomspace,printedheart/atomspace,Tiggels/opencog,inflector/atomspace,sumitsourabh/opencog,AmeBel/opencog,ceefour/opencog,roselleebarle04/opencog,eddiemonroe/opencog,AmeBel/atomspace,rodsol/atomspace,eddiemonroe/atomspace,TheNameIsNigel/opencog,misgeatgit/opencog,yantrabuddhi/opencog,rohit12/opencog,andre-senna/opencog,shujingke/opencog,kinoc/opencog,rTreutlein/atomspace,kim135797531/opencog,ArvinPan/opencog,virneo/opencog,gavrieltal/opencog,printedheart/opencog,jlegendary/opencog,inflector/atomspace,rodsol/atomspace,sumitsourabh/opencog,jlegendary/opencog,andre-senna/opencog,eddiemonroe/atomspace,rohit12/opencog,eddiemonroe/opencog,iAMr00t/opencog,misgeatgit/opencog,rohit12/opencog,Allend575/opencog,AmeBel/opencog,zhaozengguang/opencog,yantrabuddhi/opencog,tim777z/opencog,sanuj/opencog,kim135797531/opencog,virneo/opencog,sanuj/opencog,printedheart/atomspace,kinoc/opencog,misgeatgit/opencog,Selameab/opencog,roselleebarle04/opencog,cosmoharrigan/atomspace,shujingke/opencog,jlegendary/opencog,AmeBel/atomspace,eddiemonroe/opencog,AmeBel/opencog,sumitsourabh/opencog,ceefour/atomspace,shujingke/opencog,williampma/opencog,gavrieltal/opencog,andre-senna/opencog,TheNameIsNigel/opencog,sumitsourabh/opencog,Selameab/opencog,kinoc/opencog,ruiting/opencog,prateeksaxena2809/opencog,gavrieltal/opencog,Selameab/atomspace,kinoc/opencog,jlegendary/opencog,yantrabuddhi/opencog,MarcosPividori/atomspace,shujingke/opencog,jlegendary/opencog,ruiting/opencog,ceefour/opencog,zhaozengguang/opencog,MarcosPividori/atomspace,gaapt/opencog,yantrabuddhi/atomspace,printedheart/opencog,misgeatgit/opencog,williampma/atomspace,gaapt/opencog,rohit12/atomspace,rTreutlein/atomspace,printedheart/opencog,iAMr00t/opencog,tim777z/opencog,gavrieltal/opencog,kim135797531/opencog,rodsol/opencog,TheNameIsNigel/opencog,ruiting/opencog,zhaozengguang/opencog,zhaozengguang/opencog,anitzkin/opencog,inflector/opencog,eddiemonroe/opencog,williampma/atomspace,andre-senna/opencog,misgeatgit/atomspace