Patches for issues 42 and 43 at http://code.google.com/p/waf-fle/issues/ and added filter for Preserved Events

1. Patch for RAW event change when "Use Client IP from header" checked. See http://code.google.com/p/waf-fle/issues/detail?id=42
2. Patch for bad host header int the index file handling (mlog2waffle related)
3. Added filter for preserved events (see issue #5 )