Checkpoint before major refactor to use conditional inlines.

git-svn-id: svn://graphite/diminuto/trunk@547 5dfbf39a-1452-0410-8a97-9e58fedde8e3
isleaf used.

git-svn-id: svn://graphite/diminuto/trunk@548 5dfbf39a-1452-0410-8a97-9e58fedde8e3
isempty and isorphan used.

git-svn-id: svn://graphite/diminuto/trunk@549 5dfbf39a-1452-0410-8a97-9e58fedde8e3
isred and isblack used.

git-svn-id: svn://graphite/diminuto/trunk@550 5dfbf39a-1452-0410-8a97-9e58fedde8e3
Forgot to add unit test to index.

git-svn-id: svn://graphite/diminuto/trunk@551 5dfbf39a-1452-0410-8a97-9e58fedde8e3
Meant to leave test in progress disabled.

git-svn-id: svn://graphite/diminuto/trunk@552 5dfbf39a-1452-0410-8a97-9e58fedde8e3
Expanded pointer sanity test.
Still working on unit test suite.