add @SuppressWarnings("unused"), because
@SuppressWarnings("PointlessBooleanExpression") is not understood by
Eclipse
removed unused imports
Revert "add @SuppressWarnings("unused"), because"

This reverts commit 8fba1774a5f5d7e6b93decf2e979ae97ebcdbb3c.
Merge pull request #274 from Helpstone/IZPACK-1164

Izpack-1164: Remove unused imports