Change NameSpace definition in top CMakeLists.txt so that it matches Simbody convention, in particular: CMake variable now shows as BUILD_USING_NAMESPACE and does not include trailing "_". Also mark BUILD_JAVA_WRAPPING and BUILD_API_ONLY as Advanced to minimize exposed options in the most common use cases in prep for Source release.
Change NameSpace definition in top CMakeLists.txt so that it matches Simbody convention, in particular: CMake variable now shows as BUILD_USING_NAMESPACE and does not include trailing "_". Also mark BUILD_JAVA_WRAPPING and BUILD_API_ONLY as Advanced to minimize exposed options in the most common use cases in prep for Source release.

git-svn-id: 9e047e1e624cce0a2485e750063112e834f85522@7588 fc29be9c-2cb0-420d-b520-73dbd18add6e

opensim-org/opensim-gui,opensim-org/opensim-gui,opensim-org/opensim-gui,opensim-org/opensim-gui