Release 1.4.0 (#257) * Delete double "support" link * Update to CodeIgniter 3.1.11 * Update to Bootstrap 4.4 * Rework all views to fit with Bootstrap 4 * Update FPDF from v1.81 to v1.82 Rename folder "fpdf181" to "fpdf" to make future updates easier. * Update MY_Controller base controller * Update MY_Model base model * Add hard delete option in MY_Model Add a parameter in delete function of the generic MY_Model to be able to force deletion even if a soft delete key is defined. * Add undelete method in MY_Model The undelete method is used to rollback a soft deletion. * Implement CodeIgniter-HMVC project structure Implement "common", "support" and "user" modules. * Add CIPHPUnit testing * Remove import functions * Remove PHPExcel * Add warning message in header if environment is not set to production * Disable unimplemented question types