Display the Script Repository Folder

Add a link to open the folder if the user wants, to give the user a fast way
to add, remove files from the repository.

re #7120
Reedit ScriptRepositoryView.ui to avoid conflicts

Change the order and names to avoid conflict with develop.

re #7120
Merge branch 'feature/7120_repo_folder_visible' into develop

Conflicts:
	Code/Mantid/MantidQt/API/inc/MantidQtAPI/ScriptRepositoryView.ui
re #7120