autounlock overhaul

This gives the player more control over what autounlock does.  It is
now a compound option rather than a boolean, and takes values of
  autounlock:none
  !autounlock or noautounlock (shortcuts for none)
  autounlock:untrap + apply-key + kick + force (spaces are optional
    or can be used instead of plus-signs, but can't mix "foo bar+quux")
  autounlock (without a value, shortcut for autounlock:apply-key).
Default is autounlock:apply-key.

Untrap isn't implemented (feel free to jump in) so is suppressed from
the 'O' command's new sub-menu for autounlock.  It's parsed and
accepted from .nethackrc but won't accomplish anything.

[Just musing: it should be feasible to kick in direction '.' to break
open a container or #force to an adjacent spot to break open a door.
If that was done, autounlock:kick+force (or more likely autounlock:
apply-key+kick+force when lacking a key) would resort to force if hero
couldn't kick due to wounded legs or riding.

This changes struct flags so increments EDITLEVEL again.

This includes pull requests #750 from entrez and #751 from FIQ but was
entered from scratch rather than using use their commits.

Closes #750
Closes #751

include/flag.h

@@ -20,7 +20,6 @@ struct flag {
     boolean autodig;         /* MRKR: Automatically dig */
     boolean autoquiver;      /* Automatically fill quiver */
     boolean autoopen;        /* open doors by walking into them */
-    boolean autounlock;      /* automatically apply unlocking tools */
     boolean beginner;        /* True early in each game; affects feedback */
     boolean biff;            /* enable checking for mail */
     boolean bones;           /* allow saving/loading bones */
@@ -63,6 +62,11 @@ struct flag {
     boolean tombstone;       /* print tombstone */
     boolean verbose;         /* max battle info */
     int end_top, end_around; /* describe desired score list */
+    unsigned autounlock;     /* locked door/chest action */
+#define AUTOUNLOCK_UNTRAP    1
+#define AUTOUNLOCK_APPLY_KEY 2
+#define AUTOUNLOCK_KICK      4
+#define AUTOUNLOCK_FORCE     8
     unsigned moonphase;
     unsigned long suppress_alert;
 #define NEW_MOON 0