Minor change to METAL slot handling. Convert unfilled 'define-slot' to...

Minor change to METAL slot handling.  Convert unfilled 'define-slot' to neutral 'slot' instead of active 'fill-slot' on expansion.

lib/python/TAL/TALDefs.py

@@ -31,6 +31,7 @@ KNOWN_METAL_ATTRIBUTES = [
     "use-macro",
     "define-slot",
     "fill-slot",
+    "slot",
     ]
 
 KNOWN_TAL_ATTRIBUTES = [

lib/python/TAL/TALInterpreter.py

@@ -268,7 +268,7 @@ class TALInterpreter:
                 name = prefix + "use-macro"
                 value = macs[-1][0] # Macro name
             elif suffix == "define-slot":
-                name = prefix + "fill-slot"
+                name = prefix + "slot"
             elif suffix == "fill-slot":
                 pass
             else:

lib/python/TAL/tests/output/test_metal1.html

@@ -22,7 +22,7 @@
 
 <span metal:use-macro="OUTER2">
   AAA
-  <xxx metal:fill-slot="OUTERSLOT">
+  <xxx metal:slot="OUTERSLOT">
   <span>INNER</span>
   </xxx>
   BBB
@@ -48,7 +48,7 @@
 
 <span metal:use-macro="OUTER3">
   AAA
-  <xxx metal:fill-slot="OUTERSLOT">
+  <xxx metal:slot="OUTERSLOT">
   <span>INNER
     <xxx>INNERSLOT</xxx>
   </span>
@@ -63,7 +63,7 @@
 </span>
 
 <span metal:use-macro="INNER3">INNER
-    <xxx metal:fill-slot="INNERSLOT">INNERSLOT</xxx>
+    <xxx metal:slot="INNERSLOT">INNERSLOT</xxx>
   </span>
 
 <span metal:use-macro="INNER3">INNER