Chronicle of major events, and livelog

Log game events, such as entering a new dungeon level, breaking
a conduct, or killing a unique monster, in a new "Major events"
chronicle. The entries record the turn when the event happened.
The log can be viewed with #chronicle -command, and the entries
also show up in the end-of-game dump, if that is available.

This feature is on by default, but can be disabled by
defining NO_CHRONICLE compile-time option.

This also contains "live logging", writing the events as they
happen into a single livelog-file. This is mostly useful for
public servers. The livelog is off by default, and must be
compiled in with LIVELOG, and then turned on in sysconf.

Mostly this a version of livelogging from the Hardfought server,
with some changes.

src/do.c

@@ -294,7 +294,10 @@ doaltarobj(struct obj *obj)
 
     if (obj->oclass != COIN_CLASS) {
         /* KMH, conduct */
-        u.uconduct.gnostic++;
+        if (!u.uconduct.gnostic++)
+            livelog_printf(LL_CONDUCT,
+                           "eschewed atheism, by dropping %s on an altar",
+                           doname(obj));
     } else {
         /* coins don't have bless/curse status */
         obj->blessed = obj->cursed = 0;
@@ -1502,6 +1505,8 @@ goto_level(
         }
         mklev();
         new = TRUE; /* made the level */
+        livelog_printf(LL_DEBUG, "entered new level %d, %s",
+                       dunlev(&u.uz), g.dungeons[u.uz.dnum].dname);
 
         familiar = bones_include_name(g.plname);
     } else {