BLTI-211

Only send the ext_sakai_session value if the placement property is:

imsti.ext_sakai_session=true

This was only for LinkTool compatibility and unnecessarily sprays around
a user's session to external tools when it is not needed by that tool.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120375 66ffb92e-73f9-0310-93c1-f5514f145a0a
BLTI-92

Remove the "gen.alert" string - it is really not needed.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120377 66ffb92e-73f9-0310-93c1-f5514f145a0a
BLTI-213

Escape debug output.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@120379 66ffb92e-73f9-0310-93c1-f5514f145a0a