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_name.c

@@ -1343,7 +1343,14 @@ oname(struct obj *obj, const char *name)
             alter_cost(obj, 0L);
         if (g.via_naming) {
             /* violate illiteracy conduct since successfully wrote arti-name */
-            u.uconduct.literate++;
+            if (!u.uconduct.literate++)
+                livelog_printf(LL_CONDUCT | LL_ARTIFACT,
+                               "became literate by naming %s",
+                               bare_artifactname(obj));
+            else
+                livelog_printf(LL_ARTIFACT,
+                               "chose %s to be named \"%s\"",
+                               ansimpleoname(obj), bare_artifactname(obj));
         }
     }
     if (carried(obj))