Allow to specify -addmods for Java 9 support, update to JaCoCo 0.7.7 for initial Java 9 support and add target to create a combined JUnit report

Conflicts:
	build.xml

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1754687 13f79535-47bb-0310-9956-ffa450edef68
1 file changed