Vladimir Marangozov's long-awaited malloc restructuring.
For more comments, read the patches@python.org archives.
For documentation read the comments in mymalloc.h and objimpl.h.

(This is not exactly what Vladimir posted to the patches list; I've
made a few changes, and Vladimir sent me a fix in private email for a
problem that only occurs in debug mode.  I'm also holding back on his
change to main.c, which seems unnecessary to me.)
diff --git a/Modules/dlmodule.c b/Modules/dlmodule.c
index 76d0540..b40e05e 100644
--- a/Modules/dlmodule.c
+++ b/Modules/dlmodule.c
@@ -54,7 +54,7 @@
 	PyUnivPtr *handle;
 {
 	dlobject *xp;
-	xp = PyObject_NEW(dlobject, &Dltype);
+	xp = PyObject_New(dlobject, &Dltype);
 	if (xp == NULL)
 		return NULL;
 	xp->dl_handle = handle;
@@ -67,7 +67,7 @@
 {
 	if (xp->dl_handle != NULL)
 		dlclose(xp->dl_handle);
-	PyMem_DEL(xp);
+	PyObject_Del(xp);
 }
 
 static PyObject *