bumped migration counter.
added migration for splitting up the ilm_session_facet_learner table.
replaced ilm_session_facet_learner with separate join tables.
bumped migration counter.
replaced triggers on ilm_session_facet_learner with triggers on ilm_session_facet_x_learner/group.
removed redundant DELETE from nuke_session() function since cascading deletes via fkey constraints already handle this.
Merge branch 'feat211_replace_offering_learner' into feat211_replace_ilm_session_facet_learner
updated queries according to schema changes.
replaced join table name in deleteGroupWithGroupId().
required queries in getIndependentLearningFacet() to support schema changes.
reimplemented getLearnerGroupsForSILM() due to schema changes.
updated join table reference.
replaced ilm_session_facet_learner with ilm_session_facet_x_group in queries.
added accidentally removed closing curly back in.
Merge pull request #276 from stopfstedt/feat211_replace_ilm_session_facet_learner

replaced ilm_session_facet_learner with separate join tables.
aded migration for splitting up the ilm_session_facet_instructor table.
fixed insert triggers creation.
bumped migration number
bumped migration number.
updated code comments.