from micherd: functions_without_Exception.sql, fixes in functions.sql #286

#286FIX problem with NULL in PHP

ADD: drop functios helper script; FIX: plan_create agatin #286

FIX: syntax errors in functions.sql #286

ADD: functions_08_09_18.sql #286

FIX: signinbyopenid #286

fix(functions): getrates, deletemodule, deletesubmodule, students_getdisciplines

FIX: media/js/discipline/editStructure.js formatting error

fix(sql): functions and tables

fix(pgsql #286): merge two files with functions

fix: dean office functions

fix(pgsql #286): getfullinfo

FIX: log form download #286

* Fix student list in teacher's dashboard