Added option to indexing to force all readers to update to the latest data in the index.
Merge pull request #391 from jesseeichar/improvement/lucene-get-latest

Added option to indexing to force all readers to update to the latest data in the index.
Fix minor findbugs warning
Merge branch 'develop' of https://github.com/geonetwork/core-geonetwork into develop
Small performance improvement.  Don't copy all files each time.
pom changes where causing problems
Major performance improvements for integration tests.
Merge branch 'improvement/integration_test_performance' into improvement/lucene6_1