Build cpp0x module using new subtree structure

Update paths in cetlib_module.cmake to reflect subtree structure.
Use SOURCES argument in cet_test calls in cetlib_module_tests.cmake
as cet_test assumes it will be called in the same directory where the test
source exists.

Add cetlib OBJECT library and headers paths to build of FNALCore.

Note that three tests currently fail:

- value_ptr_test_2: Due to a GCC-ism in the code
- LibraryManager_t: due to library lookup path issues
- PluginManager_t: due to library lookup issues