IOMAD: default certificates not showing right dates for managers accessing a user.  Fixes #143
IOMAD: methods to allocate licenses changed to mirror that for enrolling users on courses.
IOMAD: Update to how user licenses are handled closes enhancement #144
Merge branch 'IOMAD_28_STABLE' of git.e-learndesign.co.uk:moodle into IOMAD_28_STABLE