scripts: Renamed -w/--wait -> -t/--wait

I'm trying to avoid the inevitable conflict with -w/--word, which will
probably become important when exploring non-32-bit filesystem
configurations.

Renaming this to -t/--wait still conflicts with -t/--tree and -t/--tiny,
but as a debug-only flag, I think these are less important.

Oh, and -t/--trace, but test.py/bench.py are already quite different in
their flag naming  (see -d/--disk vs -d/--diff).

---

Renamed a few other flags while tweaking things:

- -t/--tiny -> --tiny (dropped shortform)
- -w/--word-bits -> -w/--word/--word-bits
- -t/--tree -> -R/--tree/--rbyd/--tree-rbyd
- -R/--tree-rbyd -> -Y/--rbyd-all/--tree-rbyd-all
- -B/--tree-btree -> -B/--btree/--tree-btree

After tinkering with it a bit, I think the -R/-Y/-B set of flags are a
decent way to organize the tree renderers. At least --tree-rbyd-all does
a better job of describing the difference between --tree-rbyd and
--tree-rbyd-all.

scripts/dbgrbyd.py

@@ -1382,7 +1382,7 @@ class TreeArt:
                 else:
                     alts[ralt.toff] |= {'nf': ralt.off, 'c': ralt.color}
 
-        if args.get('tree_rbyd'):
+        if args.get('tree_rbyd_all'):
             # treat unreachable alts as converging paths
             for j_, alt in alts.items():
                 if 'f' not in alt:
@@ -1700,8 +1700,8 @@ def dbg_tree(rbyd, *,
 
     # precompute tree renderings
     t_width = 0
-    if (args.get('tree')
-            or args.get('tree_rbyd')
+    if (args.get('tree_rbyd')
+            or args.get('tree_rbyd_all')
             or args.get('tree_btree')):
         tree = TreeArt.fromrbyd(rbyd, **args)
         t_width = tree.width
@@ -1714,8 +1714,8 @@ def dbg_tree(rbyd, *,
         print('%08x: %s%*s %-*s  %s' % (
                 rattr.toff,
                 tree.repr((rid, rattr.tag), color)
-                    if (args.get('tree')
-                        or args.get('tree_rbyd')
+                    if (args.get('tree_rbyd')
+                        or args.get('tree_rbyd_all')
                         or args.get('tree_btree'))
                     else '',
                 2*w_width+1, '%d-%d' % (rid-(rattr.weight-1), rid)
@@ -1867,15 +1867,18 @@ if __name__ == "__main__":
             action='store_true',
             help="Don't truncate, show the full contents.")
     parser.add_argument(
-            '-t', '--tree',
+            '-R', '--tree', '--rbyd', '--tree-rbyd',
+            dest='tree_rbyd',
             action='store_true',
             help="Show the rbyd tree.")
     parser.add_argument(
-            '-R', '--tree-rbyd',
+            '-Y', '--rbyd-all', '--tree-rbyd-all',
+            dest='tree_rbyd_all',
             action='store_true',
             help="Show the full rbyd tree.")
     parser.add_argument(
-            '-B', '--tree-btree',
+            '-B', '--btree', '--tree-btree',
+            dest='tree_btree',
             action='store_true',
             help="Show a simplified btree tree.")
     parser.add_argument(