Use more proper spelling for JAT__TEST_ID

src/jat.sh.skel

 #     included within the log, see BEHAVIOR EVIDENCE ID section for more
 #     details.
 #
-#  *  `-c CASEID`   Case ID; together with $JAT__TESTID can be used to
+#  *  `-c CASEID`   Case ID; together with $JAT__TEST_ID can be used to
 #     uniquely identify a particular test case, with granularity up to
 #     single assert.  CASEID set here is joined with any CASEIDs set
 #     by active phase.
 #
 # Test name
 #
-JAT__TESTID=${JAT__TESTID:-_jat_anon_test_}
+JAT__TEST_ID=${JAT__TEST_ID:-_jat_anon_test_}
 
 #
 # Test version
             echo "format: $__JAT__LOG_FMT"
             echo "jat_version: $__JAT__SELF_VERSION"
             echo "test:"
-            echo "    id: $JAT__TESTID"
+            echo "    id: $JAT__TEST_ID"
             echo "    version: $JAT__TEST_VERSION"
             echo "start: $(__jat__newstamp)"
             echo "events:"
     local beids=()
     local pairs=()
     local real_beids=()
-    local caseid="$JAT__TESTID"
+    local caseid="$JAT__TEST_ID"
     local pcaseid
     local reading=beids
     local pair