Zabbix

 - 'sql' fixes in 'trunk/frontends/php/popup.php' (Eugene)
 - minor fix of 'trunk/src/libs/zbxcommon/misc.c' (Eugene)
 - developed SLA calculation periods (Eugene)
 - developed flexible update intervals for items (Eugene)

ported r3213 (fix for 'delay_flex' collumn) from 'branches/1.1-lk/'
ported r3202 (flexible update intervals) from 'branches/1.1-lk/'
ported r3207 (SLA calculation periods) from 'branches/1.1-lk/'