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

The problem was in precedence of ternary operator and + sign.

Merge branch 'fix-nan'

+ Move ajax requests to promises base
+ Define constants for API URLs
+ Handle errors based on network connections problems as well as server-side logic errors
+ Generalize code so it can be used by modules & submodules simultaneously
+ Update name of module after 1 second, not waiting for focus out event

Just moved id attributes to data-id.
Don't think it was such a critical issue as I thought before.

+ Add animation for modules swaps
+ Add always / error callbacks to $.post requests
+ Remove usages of deprecated variables & functions
+ Format code, apply naming conventions

2. fix edit discipline