ISPN-3774 Create CheckStyle project and base style rules
ISPN-3774 Extend CheckStyle to allow ignoring some rules in testsuite code
ISPN-3774 Extend CheckStyle to allow verifying for an empty copyright
ISPN-3774 Introduce a CheckStyle rule to ban import statements from specific packages
ISPN-3776 Removing unused method from Lucene Directory (both versions)
ISPN-3775 Enable CheckStyle for the LuceneV3 module
ISPN-3775 Apply code style fixes as detected by the new CheckStyle rules on Lucenev3
ISPN-3775 Re-synchronize testsuite for Lucene Directory V4 vs. v3 (CheckStyle and other missing improvements)