added some convenience methods for getting grounding parameters added interfaces, classes and converters for JavaVariable and JavaParameter for JavaGrounding added remove and delte functionality for groundings (NOT yet for upnp)
added getGroundingType() to interface AtomicGrounding and all implementors moved ProcessImpl from new (see last revision) package constructs back to base process package (error)
Import of owl-s rev 6849 from https://svn.mindswap.org/owls/trunk/