In the earlier CONTRIB-412 change the dialog type selector was removed, but due to popular demand was reinstated in a subsequent CVS commit. This update (which will be in CVS for this module under the MOODLE_19_STABLE and MAIN tags) corrects some of the behavior when using the dialog types:

• corrected student-to-student behavior (couldn't previously see other students)
• added 'mod/dialogue:open' capability for students in db/access so can initiate dialogues
• fixed bug with context passing in teacher listing
• replaced calls to deprecated functions isteacher and isstudent w capability/role checks
• masking teachers with hiddenroleassignment from view by students
• fixed bug with group handling/display in SEPERATE-GROUPS mode
• added constants for dialogue types