added base code preparing advanced search of data points
added parser for host group in livestatus and zabbix backends
added item in data points list when no available
misc fixes
added host groups in zenoss components fetch
added search and add icon
renamed methods
renamed methods and clean unused code
removed inline where applicable implicitly
now return hit on data point field trigger search or item add according to the filter state
now data point load within the editor takes into account host groups
now data point filter works when all hosts is selected
hide add icon when data point search filter returns entries
data point importation with filter now works with zabbix too
fixed error in host group parsing in Zabbix backend
added support for host groups in Zenoss  backend
fixed overlapping of field in the editor
added host group in service tooltip + clean
updated changelog preparing for version 3.0.4
moved global.hpp to base.hpp