Add a time function.

luprex/cpp/core/world-accessor.cpp

@@ -654,6 +654,14 @@ LuaDefine(tangible_start, "tangible,function,arg1,arg2...",
     return LS.result();
 }
 
+LuaDefine(time, "",
+    "|Get the elapsed time in ticks since the world started running.") {
+    World *w = World::fetch_global_pointer(L);
+    LuaRet time;
+    LuaDefStack LS(L, time);
+    LS.set(time, w->clock_);
+    return LS.result();
+}
 
 LuaDefine(wait, "nticks",
     "|Wait the specified number of ticks.") {
@@ -873,7 +881,7 @@ LuaDefine(pprintx, "options",
     "|   value    - the object to pretty-print"
     "|   indent   - if false, suppress newlines and indentation (default: true)"
     "|   level    - base level of indentation (default: zero)"
-    "|   expand   - if true, force expansion of top-level table (default: false)"
+    "|   expand   - if true, force expansion of top-level table (default: true)"
     "|"
     "|About the expand flag: normally, when you print a class, it just "
     "|prints '<class name>', and when you print a tangible, it just"