NH4:Require invoke instead of apply to break wands

Applying a wand now tells the player that they need to use invoke to
break a wand.  The support for breaking a wand via invoke was added much
earlier, while NitroHack proper was still actively developed.

Compared to NetHack4, this also updates the inventory action command
list and the rewritten command quick reference accordingly.

Require the use of V rather than a to break wands
Alex Smith <ais523@bham.ac.uk>
5a49ff0346f787fb3f814fd8d407427286acb21a
Mention 'A' command in quick command reference
Add adjust to inv action menu of lettered objects

"A - adjust letter" now appears in the inventory object action menu for
all objects with a letter for their inventory slot, i.e. everything
except for gold.  Selecting it will prompt for the letter to move it to.
Don't "darken" extended terminal colors

It turns out that the "(color - 8) == darker" thing only applies to the
first 16 colors of the standard terminal color palette; other colors
turn into all sorts of strange shades when altered like this, so disable
this for those additional colors.

This is meant to go with commit ae95528b99 (NH4: configurable terminal
color mapping).
NH4: Allow "a," as a shortcut for #loot

The way this works internally is that the '-' in getobj() listings can
be replaced with ',' and then the code that uses the object can check
for &zeroobj.

Allow menus to have , as an option, put looting on a,
Alex Smith <ais523@bham.ac.uk>
6b75b3c1a6c285fc89be8d89766138f82f489bf2