Bring SWMR-related tools changes from revise_chunks to develop.

hl/tools/testfiles/w-ext-cmpd-esc-ff2.ddl

@@ -0,0 +1,11 @@
+Opened "TEST.h5" with sec2 driver.
+Monitoring dataset /DSET_CMPD_ESC...
+dimension 0: 10->13 (increases)
+    Data:
+        (10) {{{2, 2, 2}}, {4, 4}}, {{{3, 3, 3}}, {5, 5}}, {{{4, 4, 4}}, {6, 
+        (12)  6}}
+dimension 0: 13->12 (decreases)
+dimension 0: 12->1 (decreases)
+dimension 0: 1->3 (increases)
+    Data:
+        (1) {{{2, 2, 2}}, {4, 4}}, {{{3, 3, 3}}, {5, 5}}