implemented the "pics in posts" flag globally...it marks the first appearance

of "properties" storage and editing for conferences, communities, users, and
the global system.  In addition, the "global properties" editing screen got
implemented, because it wasn't there yet.

src/com/silverwrist/util/OptionSet.java

@@ -109,6 +109,19 @@ public class OptionSet extends BitSet
    *--------------------------------------------------------------------------------
    */
 
+  public boolean assign(int ndx, boolean val)
+  {
+    if (ndx>=ALPHA.length())
+      throw new IndexOutOfBoundsException();
+    boolean old = super.get(ndx);
+    if (val)
+      super.set(ndx);
+    else
+      super.clear(ndx);
+    return (old!=val);
+
+  } // end assign
+
   public void assign(char[] options)
   {
     int i;
@@ -127,7 +140,8 @@ public class OptionSet extends BitSet
 
   public void assign(String options)
   {
-    assign(options.toCharArray());
+    if (options!=null)
+      assign(options.toCharArray());
 
   } // end assign