Don't define USE_BITUBIGRAPHER unless cmake actually found Ubigraph installed
Don't define USE_BITUBIGRAPHER unless cmake actually found Ubigraph installed

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