RSM

A.F....... [ZBX-17049] fixed non well formed numeric value in maintenance.create and maintenance.update; fixed undefined index in maintenance create and update popup

* commit '598074077625b74ca71a8263eaa62d0adab71c32':
  ..F....... [ZBX-17049] fixed: timeperiodid default value being set for ajax response data
  .......... [ZBX-17049] added changelog
  A......... [ZBX-17049] removeSecondsFromTimes code moved to update/create methods
  ..F....... [ZBX-17049] added default values initialization