updating submodule external-tools to newest master
updating submodule external-tools to newest master

UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_,UCSC-MedBook/MedBook_