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/attrib.c

@@ -1149,6 +1149,8 @@ uchangealign(int newalign,
     g.context.botl = TRUE; /* status line needs updating */
     if (reason == 0) {
         /* conversion via altar */
+        livelog_printf(LL_ALIGNMENT, "permanently converted to %s",
+                       aligns[1 - newalign].adj);
         u.ualignbase[A_CURRENT] = (aligntyp) newalign;
         /* worn helm of opposite alignment might block change */
         if (!uarmh || uarmh->otyp != HELM_OF_OPPOSITE_ALIGNMENT)
@@ -1157,6 +1159,11 @@ uchangealign(int newalign,
             (u.ualign.type != oldalign) ? "sudden " : "");
     } else {
         /* putting on or taking off a helm of opposite alignment */
+        if (reason == 1) {
+            /* don't livelog taking it back off */
+            livelog_printf(LL_ALIGNMENT, "used a helm to turn %s",
+                           aligns[1 - newalign].adj);
+        }
         u.ualign.type = (aligntyp) newalign;
         if (reason == 1)
             Your("mind oscillates %s.", Hallucination ? "wildly" : "briefly");