1.6.9 released

Fix the link to the stack element class being wrongly set to the main script when encountering exceptions on additional scripts in Groovy
Fix the link to the stack element class being wrongly set to the main script when encountering exceptions on additional scripts in Ruby
Fix the link to the stack element class being wrongly set to the main script when encountering exceptions on additional scripts in Python, when using context
Fix the line numbers of additional scripts which were incorrect
Fix the file and the line of the script exceptions which would be incorrect for additional scripts