compile / jar / test of mrJars
don't include ants build.xml anymore
rename directories to match project and maven artifact names
refactor artifacts - so each project has one artifact
replace static references in hssf/dev tests with junit5 constructs, which had problems in parallel tests
increase gradle heap to 4gb because of OOM - maybe less would also work
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1888488 13f79535-47bb-0310-9956-ffa450edef68
Added CellRange return type for Sheet array formula methods. Renamed new test classes to make it clear that array formula evaluation is not being tested yet. Added extra test cases.