Zabbix

A.F.....S. [ZBXNEXT-2579,ZBXNEXT-7020] added baseline monitoring functions baslinewma,baselinedev

Merge in ZBX/zabbix from feature/ZBXNEXT-2579-5.5 to master

* commit '113a0ac50bcc8eb54232a99d04eb8b4d6e2c7c4c': (48 commits)
  .D........ [ZBXNEXT-2579] updated changelog entry
  .D........ [ZBXNEXT-2579] added changelog entry
  ........S. [ZBXNEXT-2579] fixed error message
  ........S. [ZBXNEXT-2579] fixed error message
  ........S. [ZBXNEXT-2579] fixed use of uninitialised value
  ..F....... [ZBXNEXT-2579] added validation for time shift to be aligned with period
  ........S. [ZBXNEXT-2579] improved trends function cache logging
  ........S. [ZBXNEXT-2579] changed wma weight usage with gaps in seasonal data
  ..F....... [ZBXNEXT-2579] prohibit number of seasons to be float
  ..F....... [ZBXNEXT-2579] updated baseline validation tests
  ........S. [ZBXNEXT-2579] swapped baseline funciton season/season_num parameters
  ..F....... [ZBXNEXT-2579] changed of order of Seasons-fields; introduced drop-down option for condition fields
  ..F....... [ZBXNEXT-2579] split seasons parameter; added re-focus to function field
  ..F....... [ZBXNEXT-2579] added function return type; minimums of 1h for period and seasons
  ........S. [ZBXNEXT-2579] added data period to baseline data avg/dev when calculating baselinedev
  ..F....... [ZBXNEXT-7020] added baseline function validation tests
  .......... [ZBXNEXT-7020] added changelog entry
  ........S. [ZBXNEXT-2579] added data period to baseline data avg/dev when calculating baselinedev
  ........S. [ZBXNEXT-2579] set baselinedev result to 0 if stdevpop of seasonal data is 0
  ........S. [ZBXNEXT-2579] fixed typos in function comments
  ...