More vector_base refactoring: * Implement vector_base::reserve() in terms of allocate_and_copy().
More vector_base refactoring:
* Implement vector_base::reserve() in terms of allocate_and_copy().

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40162

jbrownbridge/thrust,jbrownbridge/thrust,jbrownbridge/thrust,jbrownbridge/thrust