Make phase and session verdicts a bit smarter

Will show ERROR if there were errors in phase, and nothing (no PASS) if
there were no asserts at all (typical for diag phase).

src/jat.sh.skel

     local pverd     # phase verdict text
     local pname     # ^^ name
     local pnhint    # ^^ ^^ display
+    local errors    # count of errors
+    local warnings  # ^^ warnings
+    local asserts   # ^^ asserts
+    local fails     # ^^ fails
     pname=$(__jat__sd_keyr P.name)
+    errors=$(jat__stat perrc)
+    warnings=$(jat__stat pwarc)
+    asserts=$(jat__stat pasrtc)
+    fails=$(jat__stat pfailc)
     test "$pname" == "_jat_anon_phase_" || pnhint=" '$pname'"
-    case "$(jat__stat pfailc)" in
-        0)  pverd="$__JAT__SWORD_PASS" ;;
-        *)  pverd="$__JAT__SWORD_FAIL" ;;
+    case $errors:$warnings:$asserts:$fails in
+        0:0:0:*) pverd=""                        ;;
+        0:0:*:0) pverd=".$__JAT__SWORD_PASS"     ;;
+        0:0:*:*) pverd=".$__JAT__SWORD_FAIL"     ;;
+        0:*:*:*) pverd=".$__JAT__SWORD_TWARNING" ;;
+        *:*:*:*) pverd=".$__JAT__SWORD_TERROR  " ;;
     esac
     __jat__show \
-        "$__JAT__SWORD_PHASE.$__JAT__SWORD_END.$pverd$pnhint" \
+        "$__JAT__SWORD_PHASE.$__JAT__SWORD_END$pverd$pnhint" \
         ""
 }
 
     #
     # Show message about session $1 finalization to stderr
     #
-    local sverd         # session verdict text
-    case "$(jat__stat sfailc)" in
-        0)  sverd="$__JAT__SWORD_PASS" ;;
-        *)  sverd="$__JAT__SWORD_FAIL" ;;
+    local sverd     # session verdict text
+    local errors    # count of errors
+    local warnings  # ^^ warnings
+    local asserts   # ^^ asserts
+    local fails     # ^^ fails
+    errors=$(jat__stat serrc)
+    warnings=$(jat__stat swarc)
+    asserts=$(jat__stat sasrtc)
+    fails=$(jat__stat sfailc)
+    case $errors:$warnings:$asserts:$fails in
+        0:0:0:*) sverd=""                        ;;
+        0:0:*:0) sverd=".$__JAT__SWORD_PASS"     ;;
+        0:0:*:*) sverd=".$__JAT__SWORD_FAIL"     ;;
+        0:*:*:*) sverd=".$__JAT__SWORD_TWARNING" ;;
+        *:*:*:*) sverd=".$__JAT__SWORD_TERROR"   ;;
     esac
     __jat__show \
-        "$__JAT__SWORD_SESSION.$__JAT__SWORD_FINALIZE.$sverd"
+        "$__JAT__SWORD_SESSION.$__JAT__SWORD_FINALIZE$sverd"
 }
 
 __jat__show_sinitn() {