[ZBXNEXT-318] Server: performance improvements - ZABBIX SUPPORT

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1.	General: multiple inserts	Closed	Unassigned
2.	Speedup dbconfig synchronization	Closed	Unassigned
3.	Faster trigger update on startup	Closed	Unassigned
4.	store strings in an intern pool	Closed	Unassigned
5.	More efficient trend writing, no selects	Closed	Unassigned
6.	Caching for historical data. Faster functions min(), max(), etc	Closed	Unassigned
7.	Slow adding of trends in the array trend data (memmove)	Closed	Unassigned
8.	More efficient storage of templated items	Closed	Unassigned
9.	Parrallel writing of historical data by N processes	Closed	Unassigned
10.	More efficient update of configuration data	Closed	Unassigned
11.	One item buffer for all pollers	Closed	Unassigned
12.	New parameter to limit max number of poller parallel connections to one host	Closed	Unassigned
13.	Priority control: DB Syncer >> Trappers, Pollers,Pingers..	Closed	Alexei Vladishev
14.	Flow control: between Zabbix server and Zabbix proxy	Closed	Unassigned
15.	Slow update of IDS tables by db syncers	Closed	Unassigned
16.	Get rid of 1 sec sleep on full buffer, use semaphore instead	Closed	Unassigned
17.	Zabbix daemons must not exit after "strace -p"	Closed	Unassigned
18.	Fair priority for proxy and server data	Closed	Unassigned
19.	Still slow update of IDS tables by db syncers	Closed	Unassigned
20.	Do not update table items for each received value	Closed	Unassigned
21.	New numeric data type: small integer	Closed	Unassigned