Inlined ObjectCache._cacheEntryDir()
Inlined ObjectCache._cacheEntryDir()

There was just a single caller, in the same class, and the expanded code
is equally expressive.

At this point, the only non-static methods on ObjectCache are

* The constructor
* cacheDirectory()
* cacheSection()
* clean()
* removeObjects()

There are no operations left which merely affect a specific section of
the cache, all those calls are done via CacheSection objects.

webmaster128/clcache,webmaster128/clcache,webmaster128/clcache