LDEV-1133 Improvements to viewing and control of branching (in progress bar) in preview and normal modes. Activities of a branch are inserted into the design. Preview mode has option to viewing and testing all branches. If branch ends lesson then no following level-0 activities are shown in progress bar.
LDEV-1251, LDEV-1064. Refactored the way lessons are retrieved for the index page (fixed LDEV-1064); added interface 1.2 (jquery extension), allowing sorting of lessons via drag and drop (LDEV-1251); added ordered_lesson_ids column to lams_organisation (LDEV-1251).
LDEV-1370 Branching view now can display branch connectors and transitions correctly and link up the correct controllers. Transparent cover now resizes correctly.