ETCH-291 Fixing some compiler warnings

By removing some unused members and by correcting some unsigned/signed
some warnings are gone.

Change-Id: I792674667f276c0928b505bff9a3098ac31f9475

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1579585 13f79535-47bb-0310-9956-ffa450edef68