Fix fot #1 issue: ability to export huge data to XLSX#2

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ognivo777 wants to merge 4 commits intonextreports:masterfrom

ognivo777:master

Commits on Nov 23, 2017

Switch to poi 3.17 and use Streaming EXCELX export
tvs
committed
Switch to poi 3.17 and use Streaming EXCELX export

tvs
authored and
ognivo777
committed
Merge branch 'master' of https://github.com/ognivo777/nextreports-engine
ognivo777
committed

Commits on Jul 27, 2018

Added flush and flushNow
Taran Vladimir
committed