granular verbose message suppression mechanics

Switch to using a macro invocation Verbos(n, s) in place of the
flags.verbose checks.

Provide the mechanics for individual suppression of any of the
existing messages that were considered verbose.

Mechanics only - this code update does not provide any means of
setting the suppression bits.

iflags.verbose = 0
is still a master suppression of all the verbose messages.

iflags.verbose = 1
turns on the verbose messages only for those whose suppression
bit is 0 (not set).

src/do_name.c

@@ -728,7 +728,7 @@ getpos(coord *ccp, boolean force, const char *goal)
 
     if (!goal)
         goal = "desired location";
-    if (flags.verbose) {
+    if (Verbose(0, getpos1)) {
         pline("(For instructions type a '%s')",
               visctrl(g.Cmd.spkeys[NHKF_GETPOS_HELP]));
         msg_given = TRUE;
@@ -840,7 +840,7 @@ getpos(coord *ccp, boolean force, const char *goal)
         } else if (c == g.Cmd.spkeys[NHKF_GETPOS_AUTODESC]) {
             iflags.autodescribe = !iflags.autodescribe;
             pline("Automatic description %sis %s.",
-                  flags.verbose ? "of features under cursor " : "",
+                  Verbose(0, getpos2) ? "of features under cursor " : "",
                   iflags.autodescribe ? "on" : "off");
             if (!iflags.autodescribe)
                 show_goal_msg = TRUE;