revised .gitignore to ignore dialog history files
revised .gitignore to ignore dialog history files

pato/bwi_experimental,pato/bwi_experimental,Musi13/bwi_experimental,Musi13/bwi_experimental,pato/bwi_experimental,utexas-bwi/bwi_experimental,utexas-bwi/bwi_experimental,utexas-bwi/bwi_experimental,Musi13/bwi_experimental,Musi13/bwi_experimental,utexas-bwi/bwi_experimental,pato/bwi_experimental,Musi13/bwi_experimental,pato/bwi_experimental,pato/bwi_experimental,utexas-bwi/bwi_experimental,Musi13/bwi_experimental,utexas-bwi/bwi_experimental