[svn-r29850] Description:

Bring H5DOappend(), H5P[s|g]et_object_flush_cb, and H5P[s|g]et_append_flush
from revise_chunks branch to trunk.  Brings along updated metadata cache
entry tagging, and the internal object flush routine.

Tested on:
    MacOSX/64 10.11.4 (amazon) w/serial, parallel & production
    (h5committest forthcoming)

src/H5Fpkg.h

@@ -293,6 +293,9 @@ struct H5F_file_t {
 
     /* Metadata accumulator information */
     H5F_meta_accum_t accum;     /* Metadata accumulator info           	*/
+
+    /* Object flush info */
+    H5F_object_flush_t 	object_flush;		/* Information for object flush callback */
 };
 
 /*