remove all remnants of course authoring code
changed goodbye message for test mode
changed goodbye message for test mode
Merge branch 'master' into rm-author
Removed "dev" mode.
Removed courses from package. Added menu which offers to install suggested courses, or to direct user to swirl_courses for manual installation.
A few bug fixes and traps for situations in which the internet is unavailable.
removing cruft
Allow exit from course installation menu.
add some NEWS and increment version number