added removeFromCache method in OWLCache plus its Impl
replaced import org.apache.axis.enum.Style with org.apache.axis.Constants.Style to avoid problems for Java 1.5 added some debug code into OWLReaderImpl.readImports added silent flag in OWLCacheImpl to reduce logging
Import of owl-s rev 6849 from https://svn.mindswap.org/owls/trunk/