GA 2.7 ready for release

src/students/GA_2_7/Analysis.html

src/students/GA_2_7/README.html

src/students/GA_2_7/Report.html

src/teachers/GA_2_7/Analysis.html

src/teachers/GA_2_7/Analysis_solution.html

src/teachers/GA_2_7/README.html

src/teachers/GA_2_7/Report.html

src/teachers/GA_2_7/Report_solution.html