LDEV-61 Fixing tool sessions - all users were getting separate tool sessions.Changed name of "group" to "sessionGroup" so that the HQL wouldn't throw warnings about group being a reserved word.
added the property groupingTypeId, which previously wasnt there.when retrieving Grouping objects, the groupingTypeId was null regardless of what value was stored on database. Works okay now.
DB Changes:lams_tool: columns learning_library_id and default_tool_content_id made nullable (C Perfect's request).lams_user: column user_organisation_id removed (checked with F Yang)