NetfilterInfoHook fixed -- author ZBojthe

ned name and c++ name was different
example didn't work
GPSR: fixed shutdown/restart
GPSR: fixed example
namespace: introduced a number of sub-namespaces under inet; util header files reorganized -- author ZBojthe

New namespaces:  inet::utils, inet::xmlutils, inet::serializer, inet::math,
inet::mpls_constants, inet::ieee80211, inet::httptools, inet::tcp, inet::rtp,
inet::sctp

OSPF, BGP: moved all classes into the inet::ospf / inet::bgp namespaces

Other:
- FWMath.h renamed to INETMath, FWMATH class replaced with namespace
- InitStages: moved to inet namespace
- common.h removed
- opp_utils.h renamed to INETUtils.h
- added createOne()/createOneIfClassIsKnown() that takes current namespace into account
- DYMOFau: renamed DYMO.cc,.h,.ned to DYMOFau
- DYMO: xDYMO.cc,.h,.ned renamed to DYMO.*
- DSR-UU: namespace fix
- dsr minor changes
- GenericRoutingTable: added signal declarations
- ModulePathAddress: bugfix in str() function
- ModuleIdAddress: minor fix
- feature related changes: FeatureBuildTest, Makefile, doxygen config
- ~ieee80211 - REVISE IT