Remove atlas_depends_on_subdirs and update external and link
dependencies.

The `TestPolicy` dependency stems mostly from the automatic `requirements`
to `CMakeLists.txt` file migration. In cmake builds, the TestPolicy
package is mostly useless apart from a few header files. So most
packages do no need this dependency anymore.

	* Tagging RelationalCollection-00-02-08.
	* Fix clang warnings: auto_ptr -> unique_ptr.

2015-02-23  Charles Leggett

	* Tagging RelationalCollection-00-02-07
	* Fix to compile with new Gaudi plugin service, using
	variable-length template lists, with backward compatibility

2015-02-23  scott snyder  <snyder@bnl.gov>

	* Tagging RelationalCollection-00-02-06.
	* Fix to compile with new Gaudi plugin service, using
	variable-length template lists.