Janitor: clang complains about self assignment
Revert "Janitor: clang complains about self assignment"

This reverts commit e5b48a5850426f6a1eb8901f36e8f20e4da5e6b8.
Merge branch 'master' of github.com:ellson/graphviz
Janitor: clang complains about self assignment of doubles
Janitor: ignore product: cmd/tools/gvpack_static
Janitor:  api_t is unsigned and can't be -ve
missing extern for func defined in common
Merge branch 'master' of github.com:ellson/graphviz